Interrogative and declarative sentences are two of the four basic types of sentences -- the other two being exclamatory and imperative. In order for a sentence to be one of these two types of sentences, certain conditions must be met.
An interrogative sentence asks a question. These types of sentences always end in a question mark. Thinking of the word "interrogation," a formal questioning often done by police officers, may help you remember what an interrogative sentence is.
"Are we there yet?" is an example of an interrogative sentence. A question mark always gives away an interrogative sentence.
A declarative sentence makes a statement. Declarative sentences always end with a period. The word "declaration," a formal announcement or statement, may help you remember what a declarative sentence is.
"The man is standing by the window" is an example of a declarative sentence. It states a simple fact and ends with a period. The period does not necessarily mean that a sentence is declarative, however. Imperative sentences also end in periods.
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