Determine the subject. The subject is the person, place, thing or idea that is doing or being something in a sentence.
Determine the verb, which is the action you are inquiring about.
To form a simple yes/no interrogative, combine the subject and the verb to form an explicit yes or no answer question. For example, in the question "Did you go to work?" the subject is "you" and "go to work" is the verb.
To form alternative interrogative questions, combine the subject and the verb to form a question. An alternative interrogative will elicit two or more possible responses. For example, the question "Do you prefer tea, coffee or cappuccino?" The question is an alternative interrogative because there are more than two possible answers.