用how long。How long have you lived here?I have lived here for a long time.在現(xiàn)在完成時出現(xiàn)for+一段時間,謂語動詞用延續(xù)性動詞。
一、當for引導(dǎo)的時間短語用來修飾具有靜態(tài)意義的動詞是常??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for與all開頭的名詞短語連用時,必須省略for.
She’s been lying in bed all day.
三、當for短語修飾動態(tài)動詞時或者用于否定句是,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for用在句子開頭時,一般也不能省略。請比較:
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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