Present Perfect Question Form

Yes / No Questions

To form questions use:

• Have / has + subject + past participle

Examples:

• Have you seen this movie before?
• Has the number 10 bus come yet?
• Have they gone to bed already?
• Has Marie lost weight?
• Have you missed me since I left?

We can answer no questions with a full or a shorter answer by using contractions (hasn't / haven't) with negative answers.

Examples:

Have you done your homework?

• Yes, I have done my homework.
• Yes, I have. (short answer)
• No, I have not done my homework.
• No, I haven't. (short answer)

Have they eaten?

• Yes, they have eaten.
• Yes, they have. (short answer)
• No, they have not eaten.
• No, they haven't. (short answer)

Wh- Questions Present Perfect

Notice the word order. The wh- question word comes before "have / has " and then the past participle.

Examples:

• How long have you studied English?
• Where has your mother gone?
• Why has the train stopped here?
• Who have they hired to organize the conference?
• What has the girl brought in her bag?
• How much of the meat has your dog eaten?

Further information go to: 

http://www.learn-english-have-fun.com/present-perfect.html