interrogative sentence

If an interrogative sentence ends with a quotation, the point of interrogation stands outside the inverted commas.

In an interrogative sentence including a Personal Pronoun and a Noun, as, co e am fear sin?

This interrogative sentence is introduced by the interrogative adverb why.

Every interrogative sentence should end with a question mark.

We call the second, regardless of its form, an interrogative sentence because it asks a question (interrogates).