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用“when.” 造句有几种句式?

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用“when.” 造句有几种句式?
用“when.” 造句有几种句式?
一般是下面的三种:
He could swim when he was 3 years old.他3岁时会游泳.
He was doing his homework when his father came home..当他父亲回家时他正在做作业.
I will tell you when he comes back .当他回来时我会告诉你.