While 后面跟的從句里的動(dòng)作是正在進(jìn)行時(shí) he comes home while his mother is cooking.when就不是了 he comes home when his mother cooks.非常感謝喲！想再請(qǐng)問(wèn)下when/while she was visiting the museum, an alien came in. 這個(gè)位置互換的理由是什么呢當(dāng)從句的謂語(yǔ)是表動(dòng)作的延續(xù)性動(dòng)詞時(shí)，when, while才有可能互相替代。如：While / When we were still laughing, the teacher came in.正當(dāng)我們?nèi)栽诖舐曟倚r(shí)，老師進(jìn)來(lái)了。