用how long。How long have you lived here?I have lived here for a long time.在現(xiàn)在完成時(shí)出現(xiàn)for+一段時(shí)間,謂語(yǔ)動(dòng)詞用延續(xù)性動(dòng)詞。
一、當(dāng)for引導(dǎo)的時(shí)間短語(yǔ)用來(lái)修飾具有靜態(tài)意義的動(dòng)詞是常??梢允÷?。如:
They lived in China (for) seven years.
The meeting lasted (for) two hours.
They will be in Chicago (for) a year.
二、當(dāng)for與all開(kāi)頭的名詞短語(yǔ)連用時(shí),必須省略for.
She’s been lying in bed all day.
三、當(dāng)for短語(yǔ)修飾動(dòng)態(tài)動(dòng)詞時(shí)或者用于否定句是,則借此for不能省略。
I’m going away for a few days.
I haven’t seen him for three weeks.
四、當(dāng)for用在句子開(kāi)頭時(shí),一般也不能省略。請(qǐng)比較:
a. He lived abroad (for) six years.
For six years, he lived abroad.
b. He waited anxiously at hospital (for) some time.
For some time, he waited anxiously at hospital.
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