英语语法求救
_____ there is life on another planet is almost impossible.
A, Whether B, Why C, That D, How
麻烦用排除法一一分析这四个选项？
请详细解释下具体原因
答：C
译：在另一个行星上有生命，这几乎是不可能的。
ABD都是由疑问句变过来的是主语从句，是个问题。而系表却是一个明确的陈述（是不可能的）。如选ABD，则系表应为：is unclear. 且D还不通，因为how不可能用来修饰be(状态动词）。
1. 这两种改法都可以，不过最好是在me前面加上to.
2. announce是及物动词，其常用结构有：
1）announce sth/宾语从句
2）announce sth to sb，但是它不能使用双宾语结构，即没有announce sb sth短语。
3）announce sb/sth（宾语） + (to be) + 名词/形容词等（宾语补足语）
3. 所以
1）如果去掉me，则为announce + that引导的宾语从句；
如果在me前面加上to，则为announce sth to sb结构，其中宾语sth为that引导的宾语从句，因为它太长，所以后置变形为：announce to sb +that宾语从句。
2）如果要保持句意完整，最好的改法当然是在me前面加上to.
1. 为了避免重复,在hope, wish, want, like, love, decide, plan, mean, prefer,want, have to, be able to, be going to, used to, ought to等动词及习语后面出现与上文相同的不定式时,常保留不定式符号to,而把其它部分省略。如:
Ms King lied to us because she had to.
金女士跟我们撒了谎,因为她不得不这样做。
－I heard that you would go to Dalian for your holiday.
我听说你要去大连度假。
－I planned to, but I have some important business to deal with.
我原计划去的,但有重要的事情要处理。
2.当不定式在ask, advise, persuade, wish, allow, permit, tell, expect, force, invite, beg等动词后面充当宾语补足语时,为了避免重复,常保留不定式符号,而把后面的动词省略。如:
She wants to come but her parents won’t allow her to.
她想来,但她的父母不允许。
If he doesn’t want to go there, don’t force him to.
如果他不想去那里,别强迫他。
He didn’t come, though we had invited him to.
虽然我们邀请了他,但他没来。
－Did your husband give up smoking?
你丈夫戒烟了吗?
－No. He was advised to, but he wouldn’t listen.
没有。有人劝过他,但他就是不听。
3. 在特定的上下文中,为了避免重复,如果不定式为一般式to be...或完成式to have done时,则不定式符号to和be或have常一并保留,be或have之后的部分通常要省略。如:
－Aren’t you the headmaster?
你难道不是校长吗?
－No, and I don’t want to be.
我不是,而且我也不想当。
－Hasn’t he finished writing the report?
难道他还没写完报告吗?
－No, but he ought to have.
是的,但他本来应该写完。
1 you can go there again if you want to
2 i didn't go with him though he asked me (to).
3 she wants to be a nurse ,but i have told her not to be
4 she wants to go, but i tell her not to
5 he might have done the job, but i wouldn't have even if i had had time.
6 he would have been pleased to have seen her if he had been at the party, but i wouldn't have been anyway because she always spoke ill of me.
----------朋友，够了吗？--------
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