VII. The omission of shì

 

Shìcan be omitted in most cases. However, it may not be omitted under any one of the following conditions.

 

1. when the subject is a demonstrative pronoun such as zhèor ;

2. when the sentence is negative;

3. when the emphasis is on a situation which has caused a fact.

 

Shìomitted.

 

A.      (shi4) zuò huǒchē lái de. 

          我坐火车来的。

          I came by train. /It was by train that I came.

 

Shìmay not be omitted in a negative sentence:

 

B.      shì zài Shànghǎi de diànhuà. 

          我不是在上海打的电话。

          It was not in Shanghai that I called. /I did not call in Shanghai.

 

Shìmay not be omitted if the subject is a demonstrative pronoun such as:

 

C.      Zhè shì zài Běijīng mǎi de. 

          这是在北京买的。

          This was bought in Beijing. /It was in Beijing that this was bought.

         

Shìmay not be omitted if the emphasis is on a situation which has caused a fact.

 

D.      rén hěn hēi, shì shài de. 

          他人很黑,是晒的

          He is dark and that’s because of his exposure to the sun.