The baby has been asleep for an hour.这孩子睡着一个小时了。
He found it difficult to go to sleep.他发现很难入睡。
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1. how often/how soon/how long/how far
这几组词都是用来提问时间或长度的但用法不同。
①how long意为“多长/久时间”,是对句子“for…”,“since…”,
“from…to…”等表示一段时间的状语的提问,可用于过去时,将来时或完成时。如:
---How long will he be away? 他要离开多长时间?
---He will be away for two days. 两天时间。
---How long have you been a teacher? 你当老师多久了?
---For about ten years. 大约10年了。
注意:how long引导的句子动词一般为延续性动词。
②how soon意为"某事多快能发生或完成",常对句子中的in…时间状语进行提问。如:
---How soon will the building be finished? 大楼过多久才能完工?
---In a month. 一个月吧。
③how often意为"多长时间一次,每隔多久",是对句中的often, usually,
every day, sometimes, never, once a week等表示频率的副词提问,
多用于一般现在时。如:
---How often do you go to see a film?
---Once a week. ---你多长时间看1次电影?---1周1次。
④how far 是对距离的提问,意为“长达……千米/米”等。如:
-How far is it from here to the park?
It is two kilometers.--从这里到公园有多远?两千米远。
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2. hard/ hardly
(1)hard adj.& adv. 作形容词时,有“难的”,“硬的”意思,作副词时,
有“努力地”、“猛烈地”等意思。
We must work hard for our country.我们必须为祖国努力学习。
It rained hard yesterday.昨天雨下得很大。
(2) hardly adv. “简直不”、“几乎不”,在句中起否定作用。
I could hardly write at that time.那时我几乎不会写字。
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3. hear/ hear of/ hear from
(1)hear 为及物动词,“听到”,表结果。
I can hear you clearly.我能清楚听到你说的话。
(2)hear of = hear about 为不及物动词,指某人间接地“听别人说起……”,如:
I have heard of the writer but I have never seen him.
我听人们说起这位作家,但没见过他。