u nit 1-3 语法-不定式 to do 1.不定式的基本形式与结构 动词不定式指通常由to 加上动词原形 (如to write) 所构成的一种动词形式,但在有些情况下to 可以省略
所有的主动词,不论是及物动词还是不及物动词,都有不定式形式
没有不定式形式
动词不定式在语法功能上可作主语、宾语、表语、定语和状语
2.不定式的用法 1 )不定式结构作主语 1
Te get contact with his family in Taiwan made him extremely happy since they separated more than 40 years ago. 2
To finish that task in such a short time is really a challenge. 在上述情况下,如果不定式较长,显得头重脚轻,则可由代词让作形式主语(形式主语it 不可由that 或 this 等其他代词代替),而将不定式放到后面
It made him extremely happy to get contact with his family in Taiwan since they separated more than 40 years ago. 2
John admitted that it is always difficult for him to be on time. 不定式结构所表示的动作是谁做的,即不定式的逻辑主语,通常可以通过 for sb
to do sth
结构表达: 如:1
It is quite important for us to read good books during a general review. 2
It is not difficult fot those talented s