急：初三英语题，用动词适当形式填空

Have started yet强调对现在的影响
will be 将来时
will be 他现在还没回来 回来这一动作发生在将来 所以用将来时

1.
Have you started your homework yet？ [YET是完成时的标志词]
there will be two meetings tomorrow. 【因为有tomorrow，可以判断是将来】
do you know when he will be back 【从主句中的时态可看出他还没有回来，所以用将来】

have,started
will be
will be

Have ;start (有yet用完成时)

is going to have

will be

(1)Have ;started
(2)will be
(3)will be

Have you started your homework yet?
there will be two meetings tomorrow.
do you know when he will be beck.