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it is 開頭的句子怎樣判斷是強調句還是定語從句
最關鍵是要看當還原回去的時候是否需要添加成分，另外強調句的連詞只有that/who(m). 例如： It is the hotel where they usually stay in their vacation.（定語從句） 還原后需要加介詞：They usually stay in the hotel in their vacation. It is in the hotel that they usually spend their holidays.（強調句） 還原后不需加任何成分They usually spend their holidays in the hotel.。
以it開頭的句子的類型
1) It was last night ___ I see the comet.
A. the time B. when C. that D. which
答案C. 強調句的結構是： It +be +強調部分 + that (who) + 主謂句。 強調句的連詞只有兩個，that和who。當強調的部分是人，且為句子的主語時，才用 "who"，其余用that。
原句： My father did the experiment in the lab yesterday evening.
強調主語： It was my father who did the experiment in the lab yesterday evening.
強調賓語： It was the experiment that my father did in the lab yesterday evening.
強調時間： It was yesterday evening that my father did the experiment in the lab. （注意不用when）
強調地點： It was in the lab that my father did the experiment yesterday evening.
2)It is ten years ___ Miss Green returned to Canada.
A. that B. when C. since D. as
答案C. 考點是連詞用法。 本題易誤選為A. that. 其實本句不是強調句。若是，去掉It be… that還應是一個完整的句子。而本句去掉 'It is…that'，只剩下ten years Miss Green returned to Canada. 不成句。因此本句不是強調句。
It is /was +時間+ since… 其中is has been was had been.
用it為開頭造句
it is開頭的句子的主語
* is very kind of you to give me a hand in time
* is 9o'clock when I went home解析：1、It is 是形式主語，真正的主語是you 謂語是give,me和hand是賓語，me是間接賓語，hand是直接賓語.It is 是形式主語，不是真正的主語，英語中常用這種表達方式，防止頭重腳輕.
2、It 是主語就是隱含的“它”的意思，它9點了，當我們走的時候，is 是謂語，9o'clock是賓語，when I went home是狀語從句
用it開頭的句子翻譯
It is a pity that you missed that concert.
It is Friday today.
It is raining heavily outside.
It is very difficult for me to translate that article into English.
It is the president himself that answered my question.
