1.1. Special forcefulness of expression that gives importance to something singled out; stress.
2. explanation and uses.
2.1. DO, DOES, DID + bare infinitive The auxiliary verbs do, does and did are followed by the bare infinitive to form negative and interrogative sentences in the past simple and present simple tenses:
2.2. Future time clauses. In time clauses that refer to future time (clauses with if, when, after, before, as soon as, once, until, while etc.) we use the present tenses
2.3. Past perfect with superlative forms of adjectives Tags. The past perfect is used with superlative forms of adjectives to express emphasis:
3. examples
3.1. Do you take any vitamins? He doesn't live here any more. Did you ask the shop assistant? Do, does and did can also be used in affirmative sentences to express emphasis: I do know what you mean.
3.2. Say hi from me if you see him. (present simple) Will you wait for me until I get back? (present simple) As soon as I arrive, I'll give you a call. (present simple) You can play in the garden when you have finished your homework. (present perfect) I'll be waiting outside while you are speaking to the doctor. (present continuous)
3.3. it was the strangest piece of music I had ever heard. Jill was the most beautiful girl John has ever met.
