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英语复习知识点概要How long和how soon和how often How long have you had it?你买了多久了？ 瞬时动词come/go/leave/start/arrive/buy/die/join/borrow/marry等不能与表示一段时间的状语连用。如how long, for 和 since所表示的时间。 ①他去世三年了。 不能说：He has died for 3 years. 而应说：He has been dead for 3 years/He died 3 years ago. It is 3 years since he died. ②他参军多久了？ 不能说：How long has he joined the army? 而应说：How long has he been in the army?/How long has he been a soldier?/How long is it since he joined the army? how long/how soon/how far/how often (1)how long 多久。表示一段时间，句中的动词应是延续性的。是对for 或since等所表示的时间状语的提问。 —How long have you lived here ?你在这里住多久了？ ①—For three years.3年了。②—Since 1997.从1997年至今。 ③—Since I graduated from college.从大学毕业至今。 (2)how soon (将来)多久；（过）多久（以后）。是对in 所表示的时间状语的提问。 —How soon can you finish the work?多久你能完成这工作？ —In three hours. 3小时后。 （3）how far 多远。用来提问距离。 —How far is your hometown from here?你家乡离这里多远？ —Twenty kilometres.20公里。 (4)how often(每隔)多久；多经常。用来提问频度。 —How often do you usually go home?你多久回家一次？ —Twice a month. 一个月两次。 how to do sth.是由“疑问副词+动词不定式”构成的复合结构，在句中可作表语。 How to deal with it hasn’t been decided. My question is how to feed so many people. if与unless的异同 1)通常unless 等于if not 如： I won’t go unless he comes .= I won’t go if the doesn’t come . 2)在下面的句子中不可做此替换。如： I’ll be surprised if he doesn’t have an accident .他要是不出事故，我倒会感到奇怪了。 unless 不能用于“由于未发生B而产生A”的句子，再如： I’ll be quite glad if she doesn’t come this evening.要是他今晚不来，我才高兴呢。 mix .混合mixture n. 混合物 Water and oil will not mix .油和水不相溶合。 Mix black with white 混淆黑白。 注意：下面句子中mix 的形式。 A rain is falling ,mixed with snow .雨夹着雪在下着。 I’m sorry(that)…很抱歉……。是自认为表现欠妥或做事失误时的道歉用语，其后的从句说明道歉的内容和原因。 ①I’m sorry I can’t answer the question.对不起我不会回答这个问题。 ②I’m sorry that I broke your glass.很抱歉我把你的杯子打破了。 
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