强调句和主语从句如何区分？

Question

如题所述

Answer 1

强调句将句子中的it is / was …that同时省去,句子仍然成立；而主语从句将that与后面部分代替it,成立.如：
(1) It is Li Lei’s brother that you met in the street yesterday. 你昨天在街上所见到的就是李蕾的兄弟.
本句若将It is 及 that同时省去为：You met Li Lei’s brother in the street yesterday. 句子同样成立,因此前面的句子是强调句型.
(2) It is exciting that we have succeeded in sending up Shenzhou V. 我们成功地发射了神舟五号这件事情真令人兴奋.
本句若将It is 及 that同时省去为：We have succeeded exciting in sending up Shenzhou V. 显然句子错误,因此,前面句子不是强调句型,而是主语从句.