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The verb “ 是” can be used to form a pivotal sentence with a double-function word in it. This kind of sentence usually has no subject, and the noun or noun phrase that follows “是”, which is its object, also functions as the subject of the second verb in the sentence. We often use this kind of sentence to describe or explain a situation. The verb “是” is used to emphasize the noun phrase after it (its object).
| Subject |
Predicate |
| |
V1 |
O1(S1) |
P1 |
正好 是
是
是
是
是 |
位 老中医
胃 这个零件
风
他
我 |
给她 看 病。
坏 了。
把这张画 刮下来 了。
帮助了我。
没说清楚。 |
The following are the pivotal sentences that we have already learned:
(1) 宋华让陆雨平来帮助我们。
我们请你和你朋友吃饭。
（2）有人敲门。
有几个朋友想去旅游。
（3）老师称赞她做作业认真。
爷爷奶奶喜欢她聪明。
（4）大家称他为打工头儿。
他们选我当组长。
（5）正好是位老中医给她看病。
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