Can someone please explain to me how to identifi a declartive sentence? I have to explain it to my daughter I home school and in her book it talks about they use questions, but then on the bottom it say Imperatives are also easy to idenify because the subject is always understood to be (you), then they give her 3 senteences to choose from (a) Who let the dog out? (b) All you need is love. (c) Do as you are told. I need help please.

The declarative sentence is the most important type. You can, and often will write entire essays or reports using only declarative sentences, and you should always use them far more often than any other type. A declarative sentence simply states a fact or argument, without requiring either an answer or action from the reader. You punctuate your declarative sentences with a simple period:

Or 'all you need is love.' which is a declaritive sentence.