There four types of Sentences in English Grammar : 1.Declarative sentence / 2. Imperative sentence / 3. Interrogative sentence / 4. Exclamative sentence

1. Declarative sentence : The usual function of a declarative sentence is to make a statement. It tells us something or gives information. The usual word order for the declarative is - subject + verb...
ex : I like coffee. / We did not watch TV last night.

2. Imperative sentence : The usual function (job) of an imperative sentence is to give a command or instruction. It tells us to do something. The usual word order for the declarative is - base verb...
(Note that there is usually no subject—because the subject is understood, it is YOU.) Ex : Stop! / Don't give her coffee.