小升初英语总复习：常见易错题型解析（二）(19)

　　182. We found ___A____ necessary to protect the environment. A. it B. this C. that D. what

　　【考点】 "主语+find+ it +adj. + to do sth"为一常用句型，意为"某人发现做某事……"，其中it为形式宾语（此时不可用this/that/one等代词替换），真实的宾语为后置的不定式短语。

　　183..中文：从战争开始时他就一直在那里工作。（误）He has worked there since the war has begun.

　　（正）He has worked there since the war began.（since引导的从句表示过去的某时间点，应用一般过去时。）

　　184. 中文：他去年离开家我就一直没有见过他。（误）He left home last year and I did not see him since.

　　（正）He left home last year and I haven\'t seen him since.（since后面省去的是he left home last year，前面的句子要用完成时。）

　　185. 中文：我去看他们的时候他们在吃晚餐。（误）They had supper when I went to see them.

　　（正）They were having supper when I went to see them.（他们在吃晚餐是在过去我去看他们的时间某一点上正进行的动作，应用过去进行时。）

　　中文：她两个月前去澳洲了，她许多年前到过那里。（误）She went to Australia two months ago. She has been there many years before.（正）She went to Australia two months ago. She had been there many years before.（many years before是从过去的某时之前算起的，表示过去的过去，要和过去完成时连用。）