Which are the WH-words?
An interrogative word or question word is a function word used to ask a question, such as what, which, when, where, who, whom, whose, why, whether and how. They are sometimes called wh-words, because in English most of them start with wh- (compare Five Ws).
What is a question sentence?
Interrogative Sentence Examples. An interrogative sentence asks a direct question and is punctuated at the end with a question mark. It is one of the four basic types of sentences, and it’s a highly useful one.