Interactive exercises for the English grammar topics learners search for and get wrong most often — ranked by real search demand, learner-error-corpus data, and teaching attention. Free, no sign-up, for learners anywhere.
17 exercises
📰 Articles — a, an, the & zero article
When to use a/an, the or no article — the single most common ESL error across all levels (A1–C1). Reading, gap-fill and free writing.
🌃 Participle Clauses — -ing, -ed & having + participle
Join two actions in one sentence: the active -ing vs passive -ed/-en choice, the perfect participle (having + participle) and a free-writing task. B2–C1.
More grammar topics — explained in German
🔄 Present Tenses
Present simple or present progressive? Habits and facts vs. what is happening now.
🕰️ Simple Past
Regular and irregular past forms, questions and negatives with did.
⏳ Present Perfect
have/has + past participle, and when to use it instead of the simple past.
⏮️ Past Perfect
had + past participle: which of two past actions happened first.
🔮 Future Forms
will, going to and the present progressive for plans and predictions.
🔀 Conditionals — if-clauses
Types 1, 2 and 3: which tense goes in the if-clause and which in the main clause.
🏗️ Passive Voice
Form the passive in every tense and decide when to use it.
🎛️ Modal Verbs
can, must, may, should, have to and their substitute forms.
🗣️ Reported Speech
Backshift of tenses, pronouns and time words when you report what someone said.
🔗 Relative Clauses
who, which, that, whose — and when the relative pronoun can be left out.
🔤 Gerund & Infinitive
-ing form or to + verb? Including verbs that change meaning (remember, stop, try).
🎨 Adjectives & Adverbs
quick or quickly? Forming adverbs, irregular forms and comparison.
❓ Question Tags
isn’t it?, didn’t you? — matching the tag to the auxiliary and the tense.
🔗 Linking Words
although, however, because of, despite — connecting ideas in a text.
More exercises coming soon. Still to come from the most common problem areas:
- The tense system as a whole
- Present perfect (vs. past simple)
- Prepositions
- Subject-verb agreement
- Conditionals
- Passive voice
- Modal verbs