when, as, while (表時(shí)間)
when從句動詞點(diǎn)動詞,持續(xù)性動詞均可;
as重在表示動作同時(shí)發(fā)生,伴隨進(jìn)行;
while從句動詞為持續(xù)性動詞 例:While I slept, a thief broke in.
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