An Interrogative Sentence is such a modification of a declarative sentence as is used to ask a question.

Declarative sentences are changed, or modified, into interrogative sentences in several ways:

(a) Sometimes the order of the subject and copula is changed.

The children are ready. (Declarative sentence). Are the children ready? (Interrogative sentence).

(b) Sometimes an interrogative (question-asking) word is used in place of some other word.

Mary has sent the book. (Declarative sentence). Who has sent the book? (Interrogative sentence).

(c) Often both changes are made.

The books are here. (Declarative sentence).

Where are the books? (Interrogative sentence).

Interrogative sentences are analyzed exactly like the corresponding declarative sentences; thus:

Exercise 24

Change these interrogative sentences to the corresponding declarative sentences:

1. Is the book interesting?

2. Who gave you the book?

8. When did you see Mrs. Green?

4. Are there many lakes in your state?

5. What is the baby's name?

6. Have you seen a biplane?

7. Has Mary gone to the fair?