Usage of imperative sentences

Imperative sentences start with the original form of the verb: Go home and finish your homework. "Imperative" means "command".

Gerund as subject is a noun usage of verb (because the subject is a noun), Doing exercise is good for you. Pay attention to the fact that the predicate verb is singular

to do is indefinite There are many uses of the expression, usually after an existing predicate, I come to help you. Come is already a predicate, and a sentence cannot have two predicates, so to help is used. However, in I come and help you. come and help are two co-ordinated predicates.

A sentence with a gerund as the subject is definitely not an imperative sentence. But "No + gerund" can be used to express prohibition, especially in slogans, such as

No smoking. No smoking.

No parking.No parking.

Imperative sentences express requests, commands, suggestions, etc. Predicate verbs should always be expressed in their original form (when expressing prohibition, especially slogans, etc., it can also be expressed by "No + gerund"). There is usually no subject in the sentence, an exclamation point or period is used at the end of the sentence, and a falling intonation is used. Most of them are second-person imperative sentences. Such as:

Hurry! hurry up!

Wait! Wait a minute!

Stop! stop!

When forming the negative, add do not/don’t before the verb:

Don’t hurry! Don't be too hasty!

let us, let's, let him/her/them/it + the infinitive without to are first-person and third-person imperative sentences respectively, such as:

Let us stand together in this emergency．

At this critical moment, let us unite.

Let them go by train.

Tell them to take the train.