An interrogative sentence is a type of sentence that asks a question, as opposed to sentences that make a statement, deliver a command, or express an exclamation. Interrogative sentences are typically marked by inversion of the subject and predicate; that is, the first verb in a verb phrase appears before the subject.
The following statements are true about sentences in English: A new sentence begins with a capital letter. He obtained his degree. A sentence ends with punctuation (a period, a question mark, or an exclamation point). He obtained his degree. A sentence contains a subject that is only given once. Smith he obtained his degree.