hurry,your friend is waiting for you!请问为什么这句话要用现在进行时,一般现在时不行

Hurry up.Don't have your friend waiting for too long.为什么动词用i you must hurry,( )your mother is waiting for you outside Hurry up!Your sister is waiting for you d____ Your friend is waiting for you over there. Your friend ___(wait)for you over there.为什么填waiting What are you doing for vacation 这句话为什么不是现在进行时 Who is your friend waiting? look,tina is waiting (at)the bus stop.用for为什么不行 英语同位语问题 He,who is your best friend,is waiting for you.从句变同位语 请问这句话为什么错The man who/that you talked with is my friend. 一般现在时,现在进行时 The book is interesting.请问这句话是什么时态? interest+ing算现在进行时吗?为什么?