Present simple: verb normal and only add -es/-s in 3rd person singular. In negative, add don't or doesn't.
Present continuous: use am/are/is and the verb ending in -ing.
Past simple: put the verb with -ed at the end or the second column if irregular. In negative, use wasn't/weren't/didn't, the latter with the infinitive.
Past continuous: use was/were and the verb ending in -ing.
Will: use with verb in infinitive and if negative, use won't.
Be going to: conjugate be (am/are/is) and the verb in infinitive.
Present perfect: use have/has and the 3rd column to negate haven't/hasn't. Expressions: just/yet/already/never/ever/how long/this month/this week/today/for/since.
Used to: affirmative (subject+used to+infinitive)
negative (subject+didn't use to+infinitive)
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