English grammar,
one gap at a time
Pick a form, answer ten sentences, find out what you got wrong. Every sentence here has been read and checked — more than 50,000 of them.
Pick a topic
105 forms across 29 topics. The number on the right is how many sentences that topic has to drill.
Tenses
Future Continuous Tense 1,800 sentences Positive, Negative, Questions, Wh-questions Future Perfect Continuous Tense 1,960 sentences Positive, Negative, Questions, Wh-questions Future Perfect Tense 1,800 sentences Positive, Negative, Questions, Wh-questions Future Simple Tense with "to be going to" 1,850 sentences Positive, Negative, Questions, Wh-questions Future Simple Tense with "will" 2,010 sentences Positive, Negative, Questions, Wh-questions Past Continuous Tense 1,840 sentences Positive, Negative, Questions, Wh-questions Past Perfect Continuous Tense 1,940 sentences Positive, Negative, Questions, Wh-questions Past Perfect Tense 1,910 sentences Positive, Negative, Questions, Wh-questions Past Simple Tense with "did" 1,800 sentences Positive, Negative, Questions, Wh-questions Past Simple Tense with "was/were" 1,800 sentences Positive, Negative, Questions, Wh-questions Present Continuous Tense 2,180 sentences Positive, Negative, Questions, Wh-questions Present Perfect Continuous Tense 1,990 sentences Positive, Negative, Questions, Wh-questions Present Perfect Tense 1,960 sentences Positive, Negative, Questions, Wh-questions Present Simple Tense with "do/does" 2,030 sentences Positive, Negative, Questions, Wh-questions Present Simple Tense with "to be" 1,800 sentences Positive, Negative, Questions, Wh-questionsVerbs and voice
Conditionals 2,410 sentences First, Mixed, Second, Third, Zero Gerunds and Infinitives 450 sentences Overview Modal Verbs "can/could" 1,590 sentences Affirmative, Negative, Questions Modal Verbs "have to/must/should" 1,380 sentences Affirmative, Negative, Questions Modal Verbs "may/might" 450 sentences Affirmative Passive Voice 450 sentences Future Passive Voice in Past Tense 1,500 sentences Positive, Negative, Questions Passive Voice in Present Tense 1,520 sentences Positive, Negative, Questions Reported Speech 450 sentences OverviewWords and phrases
Adjectives 2,600 sentences Quality, Quantity, Comparative, Demonstrative, Superlative Adverbs 1,870 sentences Frequency, Manner, Place, Time Articles 1,350 sentences a, an, the, Countable and uncountable, Plural forms Prepositions 2,710 sentences Cause and effect, Contrast, Manner, between, above, under and the rest, in, on, at, in, on, at Pronouns 2,780 sentences Indefinite, Object, Personal, Possessive adjectives, Possessive pronouns, ReflexiveWhich word do you need?
One choice, one page. For when the question is not which tense but which of two words goes in the gap.
The gap is where the grammar is
Every sentence hides exactly one form. Fill it and you have used the rule, not read about it.
You see the answer at once
Right or wrong, the correct form drops into the gap before you move on.
The mistakes are named
Each topic lists the errors learners actually make, and explains why they are wrong.