一般过去时：
He asked me the other day for 50 dollars to buy a new book.
一般现在时：
Sometimes people ask for more than they deserve.
一般将来时：
OK,I will ask him for the money he owes you.
将来进行时：
By the time you arrive at the airport,I will be asking for support from home.
现在完成时：
Over the past two weeks,we have asked for a clear reply from the authorities,but none has arrived yet.