1.how long多長(zhǎng)時(shí)間，多長(zhǎng)，對(duì)一段時(shí)間或物體長(zhǎng)度提問(wèn)
(常與現(xiàn)在完成時(shí)連用，對(duì)持續(xù)得時(shí)間段提問(wèn)，
對(duì)for+時(shí)間段或 since+時(shí)間點(diǎn)/since+從句 提問(wèn))
How long have you kept this book?你借這本書(shū)多長(zhǎng)時(shí)間了?
For three days.3天了
2. how often多久一次，對(duì)頻度，頻率提問(wèn)
(對(duì)次數(shù) once一次,twice兩次,three times a week 一周三次
頻度副詞always總是 usually通常 often經(jīng)常 sometimes有時(shí)， seldom很少 never從不 提問(wèn))
How often do you go to the cinema?你多久去看一次電影?
once a week.一周一次
3. how soon多久以后 對(duì) in+一段時(shí)間 提問(wèn) ,常與一般將來(lái)時(shí)連用。
How soon will your father come back？你父親多久以后回來(lái)?
In three days.3天后
4. how far多遠(yuǎn) 對(duì)距離提問(wèn)
How far is it from here to your school？從這兒到你得學(xué)校有多遠(yuǎn) ？
about3 miles.大約3英里
