在英语语法中,非限制性定语从句的谓语动词必须与主句中的谓语动词在时态、语态和人称上保持一致。如果主句中没有谓语动词,则从句中的谓语动词应与上下文中的动词保持一致。这有助于确保句子的语法正确性和清晰度。
非限制性定语从句中的谓语动词必须与主句中的谓语动词保持一致。这是因为非限制性定语从句描述的是主句中的名词或代词,而不是整个句子。因此,从句中的谓语动词必须与主句中的谓语动词在时态、语态和人称上保持一致。
下面是一些例子:
- 错误:My friend, who is a doctor, am very busy. (应该是“My friend, who is a doctor, is very busy.”)
- 错误:The book, which was written by my favorite author, have won many awards. (应该是“The book, which was written by my favorite author, has won many awards.”)
- 正确:The movie, which was directed by Steven Spielberg, was a huge success. (从句中的谓语动词“was”与主句中的谓语动词“was”保持一致。)
需要注意的是,如果主句中没有谓语动词,则从句中的谓语动词应该与上下文中的动词保持一致。
- 错误:My sister, who loves to read, is very smart. (如果上下文中提到了读书,则这个句子是正确的。但是,如果上下文中没有与读书相关的动词,则句子应该是“My sister, who loves to read, seems very smart.”)