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Declarative sentences are the most common, typical sentences.
Manila is the capital of the Philippines.
Black is my favorite color. 

Interrogative sentences are simply the questions and end with a question mark.
What time it is?
Could you close the window?

Imperative sentence is a command or request. It ends with an exclamation mark or a full stop.
Please close the window.
Don't forget to walk the dog!

Exclamatory sentences express emotions and end with an exclamation mark.
You didn't do your homework again!
I'm so sorry for what I have done!