He swung his arms as he walked. 他走路时摆动着手臂。
I couldnt remember a story to tell the children, so I made one up as I went along. 我想不出有什么故事可给孩子讲了,只好现编现讲。
3. 主长从短型:即主句是一个持续性动作,而从句是一个短暂性动作,此时可以用as或when,但不能用while。如:
It was raining hard when [as] we arrived. 我们到达时正下着大雨。
When [As] he came in, I was listening to the radio. 他进来时,我在听收音机。
二、根据主句与从句动作是否同时发生来区分
1. 若主句与从句表示的是两个同时发生的短暂性动作,含有类似汉语一就的意思,英语一般要用as 。如:
The ice cracked as [when] I stepped onto it. 我一踩冰就裂了。
He jumped to his feet as the boss came in. 老板一进来他立刻站了起来。
但是,在hardly [scarcely]when句式中,不能将when换成as。如:
Scarcely had we arrived, when it began to rain. 我们刚一到就下起雨来了。
2. 若主句与从句表示的是两个几乎同时发生的短暂性动作,含有类似汉语刚要就正要却的意思,英语一般要用as,且此时通常连用副词just。如:
I caught him just when [as] he was leaving the building. 他正要离开大楼的时候,我把他截住了。
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