(3) be about to do...when...刚要做……突然……I was just about to go swimming when our guide saw me and shouted at me.
该句中的“when”表示“正在这时”,相当于and just或and at that time. 这时不能用while / as 替换。
常见句型:(1) be about to do sth when... (2) be doing sth when... (3) be on the point of doing sth when...
【】We were swimming in the lake ____ suddenly the storm started.
A. when
B. while
C. until
D. before
【解析】选A. "when" 作连词,表示“正在这时”。意为“我正在湖中游泳,突然暴风雨来了。”只有when才能用于这种句型A. why
B. where
C. when
D. while
【解析】选C。主句用了be about to 结构,意思是“正准备做…”,与when 引起的从句连用
3).I
along the street looking for a place to park when the accident __
.
A.went; was occurring
B. went; occurred
C.was going; occurred
D.was going; had occurred
【解析】选C. 这里的主句要用过去进行时,因从句中有when 引起的从句,而且从句多用一般过去时。
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