1.Structure Form
For example
I like tea.(simple sentence)
I like tea, but I prefer coffee.(Compound sentence)
I stayed at home because it was raining.(Complex sentence)
I drink tea because it is healthy, and also coffee.(Compound-complex sentence)
Function Form
I like coffee.(Declarative)
Please sit down.(imperative)
what a beautiful day!(Exclamatory)
Where are you going?(Interrogative)