Answer:
Explanation:
These sentences are exactly like the example you've provided. Simply move the "has", "had", or "haven't" to the beginning of the sentences and add a question mark at the end.
However, for question C, you will have to change the "had" to "have"
And for question E, you must say "have my friends visited europe?"
say the question in your head, and it makes a lot easier.
