There are four types of sentences:-
1) Assertive: It is of two type- i) affirmative(this sentence is always positive this sentence do not include words like any, anyone)
and ii)negative (which uses words like no, nothing)
2) Interrogative: This sentence asks a question(❓)
3) Imperative: which gives instructions, command advice etc.
4) Exclamatory: It expresses a strong feeling or emotions. (!)