I have waited for May _ half an hour _ but she has n

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I have waited for May _____ half an hour _____ but she has not appeared _____

I have waited for May for half an hour already,but she has not appeared yet.
这句话是现在完成式
而现在完成式有几个关键字
already - 用於肯定句
yet - 用於问句及否定句(否定句一般是在句子后面)
ever - 用於问句
never - 用於否定句（句子中间）
上面这一句句子前面是肯定句,所以用already.
后面一句是否定句,所以用yet.
时间是用at for
而这里是我等了一个半小时所以是用for
因为不是说几点!
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I have waited for May _____ half an hour _____ but she has n She has waited for Daniel for half an hour?（对for half an hou I waited （for） you (for） half an hour I have waited for you since half an hour ago 此话成立吗,意思是? she has been wait for an hour she has waited for an hour 二者的 she has remained _____ i stood yesterday for an hour .a.when We have a talk for half an hour._____ we go back home.A.late they usually _____(run) for half an hour every morning The student is made _____ there for half an hour. Where has mum()?She's ()for half an hour They have waited here for half an hour的同义句 I have been there for half an hour.啥意思