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it 强调句型的一个问题.

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it 强调句型的一个问题.
the biggest problem is (the shortage of arable land).用it强调句对括号部分强调,是改为 it is the shortage of arable land that is the biggest problem .还是 it is the shortage of arable land that the biggest problem is.那个对呢?
1.第二个即It is the shortage of arable land that the biggest problem is.正确!
2.楼主要牢牢记住强调句型的构成:
It is/was + 被强调部分 + who/whom/that + 句子中未被强调部分.
做此类题目时,只要把被强调部分放前,最后加上句子剩余部分即可.
3.另:强调句型的特点是:去掉it is/was和引导词who/whom/that之后,剩下部分是一个完整的句子(大多时候需要调整句序,除非强调的正好是句子的主语).
如果答案是:It is the shortage of arable land that is the biggest problem.
则其还原为:The shortage of arable land is the biggest problem.
此与原句不符.
4.只有not...until...的强调句型不会严格按照此结构,其为:
It is/was not until + 时间状语/时间状语从句 + that + 句子/主句(还原成肯定句).
如:I didn't go to bed until 11:30 last night.
其强调句型为:It was not until 11:30 last night that I went to bed.
I didn't go to bed until my parents returned home last night.
其强调句型为:It was not until my parents returned home last night that I went to bed.