What do you think is the most helpful invention?這里是插入語(yǔ),插入語(yǔ)不影響句子的成分結(jié)構(gòu).
what do you think I can do?這里特殊疑問(wèn)詞和what和 do you think組成混合疑問(wèn)句,不是插入語(yǔ),所以句子要用正常語(yǔ)序.那做題時(shí)又怎么區(qū)分do you think到底是插入語(yǔ)還是組成混合疑問(wèn)句呢，依靠什么作為選擇依據(jù)呢既然做插入語(yǔ)不會(huì)影響句子那就 把do you think 去掉 如果句子語(yǔ)序正常不受影響那就是插入語(yǔ)，如果受影響，則是疑問(wèn)這樣的話，如果把what do you think I can do?改為what do you think can I do? 句子也應(yīng)該是對(duì)的把，改后的句子中 do you think 就是插入語(yǔ)了。What do you think is the most helpful invention？ 也可以改為混合疑問(wèn)句What do you think the most helpful invention is？ 可以嗎？為什么不可以？