Is the phrase "least favourite / favorite" grammatically correct? Read our explanation and examples regarding this common English mistake.

Study the verb 'cost', which is conjugated in the present, past, and past participle as 'cost' (not 'costed', which has a different meaning).

Study the difference between the prepositions 'by' and 'until' (and 'till'). Read explanations, see examples, and do practice exercises.

Learn how to use the phrase 'on the contrary' and see the difference between 'on the contrary' and 'however'. Read examples and try our quiz.

Read an explanation of the small difference between the conjunctive adverbs 'however' and 'on the other hand'. See grammar rules and examples

The quantifier 'amount' is used with non-count nouns, while 'number' is used by countable nouns. Read our quick grammar lesson.

Learn the four sentence structures of English: simple, compound, complex, & compound-complex. Read our explanation, examples, and do exercises.

Learn how to avoid sentence fragments, a common writing mistake. Read examples and do sample exercises to improve your grammar skills.

Read the punctuation rules for using a colon (:). See examples, common mistakes, and words commonly used with a colon. (EFL/ESL)

Learn the rules for conjunctive adverbs (transition words) and try our free exercises to improve your English and academic writing. For ESL/EAP students

Learn the grammar rules for changing direct questions to embedded questions (noun clauses). Do practice exercises to improve your English.

Study how to use coordinating conjunctions (FANBOYS) to create compound sentences. Read examples and do practice exercises for ESL students.

Learn the difference between the phrases 'According to me' and 'In my opinion.' Read examples to avoid using 'according to' incorrectly.

Read common English mistakes made by Indian/Punjabi students. Improve your English by avoiding these errors and problems in style.

Learn how and when to use a semi-colon. Read examples of proper semi-colon use and review independent and dependent clauses.

Study a common grammar mistake known as the 'comma splice', which creates a run-on sentence. Read examples and learn about independent & dependent clauses.

Study the differences between transitive and intransitive English verbs and phrasal verbs. See examples and do practice exercises.

Test your English grammar knowledge with this short quiz. The free quiz was designed for native speakers of English or advanced ESL students.

Study the difference between the adjectives 'wary', 'weary', and the phrases 'grow weary' & 'grow weary'. Read explanations and do exercises.

Study how to use the prepositions 'despite' and 'in spite of'. Read explanations and examples, and then do practice exercises (designed for ESL students).

Study the difference between the adverbs 'meanwhile' and 'in the meantime'. Read definitions, explanations, examples, and take a short quiz.

Study the difference between the English verbs 'expect' and 'suspect'. Read an explanation, see examples, and learn the grammar forms to improve your English. Written for ESL/English students.

Study subject-verb-agreement rules and practice with exercises for beginner, intermediate, and advanced ESL students. A free downloadable worksheet is available for English teachers.

Learn how to use 'had better' and the difference between had better and other modal verbs (must/have to/should). Read example sentences and learn the grammar rules. This lesson is for ESL/EFL students.

Explanation of the pronouns and demonstrative adjectives 'this/that/those/these'. Includes explanations, examples, and practice exercises.

This page explains the differences between 'have to', 'have', 'have got to', 'have to', and 'got to'. Includes example sentences and grammar rules for different tenses. Designed for ESL students.

An explanation of the difference between the conjunctions when & while in English. Contains examples and advice. Written for ESL students and teachers.

Study the difference between the coordinating conjunction 'so' and the subordinate conjunction 'so (that)'. Includes grammar explanation quiz.

An explanation of the differences between the verbs 'to lie' and 'to lay'. Includes example sentences and short quiz for students of English (ESL).

Learn the difference between the phrases 'In accordance with' and 'According to'. Contains explanation, examples and a free quiz for students of English.

Rules and exercises on forming information questions with Wh-question words (where/what/whose/etc). Includes exercises for ESL students and free worksheet.

A lesson on the rules of making yes/no questions in English. Students, study the exercises online. Teachers, download the free worksheet for ESL class.

An explanation of the difference between ergative verbs such as 'increase' that can be transitive (and used in the passive voice) and intransitive verbs.

Learn the grammar rules for comparative and superlative adjectives and study free exercises to practice. Includes downloadable worksheet for ESL class.

An explanation of the difference between the preposition 'during' & the subordinating conjunction 'while.' Includes examples & free practice exercises. ESL

An explanation of 'the' before the names of places (oceans, lakes, rivers, countries, etc.). Includes free worksheet & practice exercises for ESL students.

Learn the difference between the subject pronoun 'who' and the object pronoun 'whom'. Read an explanation and do free practice exercises.

Study how to use commas in defining & non-defining adjective clauses (relative clauses). Do free exercises or download the worksheet.

Study how to use 'where/when/whose' in adjective clauses (relative clauses). Learn the grammar rules & do practice exercises.

Study adjective clauses (relative clauses) online. Do free exercises to practice using relative pronouns (subject & object) or download the worksheet (ESL).

Study the difference between the first & second conditional. Students, read the grammar rules & do practice exercises. Teachers download the free worksheet.

Study the difference between the verbs hope and wish. See examples and do practice exercises online for ESL students or download the worksheet for free.

Study the difference between past perfect simple, past perfect progressive/continuous, past simple. See examples & do practice exercises for ESL students.

Study the difference between the past simple & present perfect (simple & progressive). Read examples and do free practice exercises online for ESL students.

Learn the difference between state verbs (non-progressive verbs) & action verbs. Study the grammar and do free exercises to practice. For ESL students.

A review of the rules of simple present & present continuous (progressive) verb tenses and free exercises for studying the present tense online (ESL).

Free exercises on verbs/adjectives followed by gerunds or infinitives. Includes an explanation of the grammar rules and quiz for students of English.

Lesson plan ideas for teaching verbs followed by gerunds or infinitives. Includes sample stories & discussion questions. Free for intermediate ESL class.

An explanation of the verb notice and its difference from the verbs note (and say/state). Explanations include examples & a quiz for ESL/English students.

An explanation of the difference between the 'so' and 'too' in English grammar. The lesson has example sentences and a free quiz for ESL students.

Explanation of the difference between the words pain, painful, and in pain. Includes example sentences and a quiz to study online for free.

Free quiz on common English mistakes made made by ESL students. Study the exercises online download the worksheet. Intermediate level. Improve your English!

An explanation of the differences between the two verbs 'need' and 'require'. For English students (ESL) and teachers interested in grammar.

Free worksheet for reviewing irregular verb conjugations (past tense & past participles) with a speaking activity for clarifying questions with mistakes.

Explanation of quantifiers 'all/many/most/some/few' with subjects in English. Includes a practice quiz for ESL students.

Table with examples and rules for each conditional in English (zero, first, second, third, mixed). Good review for ESL teachers and students. Free download.

Learn the difference between a few / few and a little & little. Includes examples and quiz to test your English grammar (for ESL students)

Students, study English online! Correct 20 common grammar mistakes made by intermediate ESL students. Good exercises to review English grammar.

How to make questions using 'How long' & 'How Far?' Includes explanation of the difference and exercises. Download the worksheet for free. (ESL/EFL)

An explanation of the difference between dead, die, died, dead, & pass away. Includes short exercise and discussion questions. For English/ESL students.

How to use ~ing / ~ed adjectives (participial adjectives) that describe feelings, e.g. bored/boring, excited/exciting. Includes quiz.

An explanation of "go home" and the common mistake "go to home." Includes a description of adverbs of place. For students of English (ESL/EFL).

The difference between 'sometime' and 'sometimes' in English. Read the explanations and do the sometime/sometimes exercises. For EFL students.

An explanation of the passive voice and the reasons why we use it. Includes active & passive sentence exercises for EFL students.

Understand the difference in English grammar between "too", "either", and "neither." Read examples and do practice exercises online. For ESL/EFL students.

Understand the difference between 'use to', to be 'used to', and 'get used to'. Includes explanations, examples, and practice exercises for ESL students.

Understand the difference between experience & experiences (countable & non-countable nouns). Read the explanation and take the 'experience' quiz. ESL/EFL

How to use the articles "a/n & the" in English. Read a helpful explanation on using the indefinite and definite article. Then study our the articles quiz.

Study how to use the indefinite articles A/An in English. Learn the importance of word sounds & do practice exercises on the indefinite article.

The differences between "so" & "such." Includes examples and exercises for beginner to intermediate ESL/EFL students.

A reference sheet of basic grammar terms English teachers need to know. Useful for English teachers & ESL/EFL students. Free to download and print.

34 common English mistakes made (grammar) by ESL/EFL students. Students, take the online quiz to fix the mistakes. Teachers, download the free worksheet.

Raise or rise? Explains the English grammar difference between the verbs raise and rise. Contains a few raise vs rise practice exercises.

other vs another: grammar tips on differences between another, the other, and other. Includes English grammar explanation and "(an)other" practice exercise.

20 Common English Mistakes made by Czech students of English. Includes explanations and a practice exercise. Check to see if you make the same mistakes.