1. how long,how soon,how often,how far
how long意為“多久，多長(zhǎng)時(shí)間”，對(duì)一個(gè)持續(xù)的時(shí)間段提問，常用“for+時(shí)間段”和“since+時(shí)間點(diǎn)”回答。
how soon意為“多快，多久以后”，對(duì)一個(gè)短暫性動(dòng)作提問，用于一般將來時(shí)的句子中，常用“in+時(shí)間段”回答。
how often意為“多長(zhǎng)時(shí)間一次”，對(duì)頻度提問，常用“once,twice,three times a week”等回答。
how far意為“多遠(yuǎn)”，對(duì)距離提問。

——How long have you been in China?——For three months.

——How soon will he come back?——In five minutes.

——How often do you visit your grandparents?——Once a week.

——How far is it from your home to your school?——About two kilometers.?

2. hard和hardly的區(qū)別
hard意為“努力地，辛苦地，劇烈地，猛烈地”，是程度副詞;hardly意為“幾乎不”，是否定副詞。 It’s raining hard. I can hardly understand his words.
3. much too和too much的區(qū)別 Much too意為“非常，極其，太”，much和too都是副詞，中心詞是too,much修飾too，以加強(qiáng)語氣，much too修飾形容詞或副詞原級(jí);too much意為“太多”中心詞是much，too修飾much，以加強(qiáng)語氣，too much修飾不可數(shù)名詞，與too many相對(duì)，too much修飾可數(shù)名詞。
There’s too much rain in summer.The car is much too expensive.
4. ago和before的區(qū)別 Ago表示以現(xiàn)在為起點(diǎn)的“以前”，和表示時(shí)間概念的詞組搭配使用，常在一般過去時(shí)的句子中修飾動(dòng)詞。
Before是指以過去或?qū)淼哪骋粫r(shí)刻為基準(zhǔn)的“以前”，也可泛指以前，常用于現(xiàn)在完成時(shí)、過去完成時(shí)和一般過去時(shí)的句子里。 The meeting began five minutes ago.I have never been to Suzhou before.
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