归纳: n 在主语 + 宾语 + 宾语补足语结构中,当宾语是动词不定式或句子时,要用it作形式宾语,将动词不定式或句子移到句子的后面去。 n 考试时,判断要不要 it,主要看句子后面有没有动词不定式或句子,若有,要选 it n 宾语、宾语补足语倒装:当宾语较长,宾语补足语较短时,为了句子结构均衡,往往采用倒装,这里不存在it的使用问题, 对下句作出判断: The development of ultrasound has made ______ early diagnosis of some fatal diseases. A. it possible B. possible C. it is D. it 该题的正确答案应为B,因为句子采用了倒装形式,原结构为: The development of ultrasound has made [early diagnosis of some fatal diseases] possible. 宾语 补足语 3) 记住以下短语: to takeas to think ofas to regardas to refer toas |