because, since, as与for用法辨析 1. because的用法 because语气最强，表示直接原因，可用于回答 why 提出的问题、引导表语从句、用于强调句等，而其余三者均不行。如： A：Why didn’t she come? 她为什么没来? B：Because she was very busy. 因为她很忙。 It is because he is clever that I like him. 是因为他聪明我才喜欢他。 2. since与as 两者所表示的原因都是人们已知的，即对已知事实…
when, while与as用法辨析 1. 根据从句动作的持续性来区分 若是“主短从长”型，即主句是一个短暂性的动作，而从句是一个持续性动作，此时三者都可用。如： As [When, While] she was waiting for the train, she became very impatient. 她在等火车时，变得很不耐烦。 若是“主长从长”型，即主句和从句为两个同时进行的动作或存在的状态，且强调主句动作或状态延续到从句所指的整个时间，此时通常要用while。如： I always listen t…
although 与 though用法辨析 1. 用作连词 两者均可用作连词，表示“虽然”，常可换用，只是although比though更为正式。如： Although [Though] she didn’t say anything I sensed (that) she didn’t like the idea. 她虽然什么也没说，但我已意识到她不喜欢这个主意。 两者所引导的从句均可有所省略。如： Although [Though] divorced they continued to live under t…
引导地点状语从句和比较状语从句的连词 一、引导地点状语从句的连词 引导地点状语从句的从属连词主要有where, wherever, everywhere, anywhere等。如： Put the medicine where children can't reach it. 把药放在孩子们拿不到的地方。 You can't camp where [wherever, anywhere] you like these days. 如今你可不能随便在哪儿宿营。 Everywhere Jenny goes she's …
引导原因状语从句和方式状语从句的连词 一、引导原因状语从句的连词 引导原因状语从句的从属连词主要有because, as, since, seeing (that), now (that), considering (that) 等。如： I didn’t recognize him because he had altered so much. 我没认出他来，因为他变了许多。 I went to bed early, as I was exhausted. 睡得早，因为我筋疲力尽了。 Since you’ve a…
引导目的状语从句和结果状语从句的连词 一、引导目的状语从句的连词 引导目的状语从句的从属连词主要有 in order that, so that, in case, for fear等。如： He studied hard in order that he could pass the exam. 他努力学习以便能考试及格。 Speak clearly so that they may understand you. 讲清楚些，以便他们能理解你。 I always keep a bottle of wine by …
引导条件状语从句的连词及用法 引导条件状语从句的连词主要有if, unless, as [so] long as, in case 等。如： If he gets any worse, we must phone for an ambulance. 要是他情况恶化，我们就得打电话叫救护车了。 Unless there is any other business, we can end the meeting. 如果没有别的事情，我们的会议可以结束了。 As long as you’ve paid in advanc…
引导时间状语从句的连词分类归纳 引导时间状语从句的连词很多，为更于理解，可分为以下三类： 1. 普通连词 如after, as, before, since, till, until, when, while等。如： I will tell you after they leave.他们走我再告诉你。 He dropped the glass as he stood up. 他站起来时，把杯子摔了。 I’d better have a think before I decide. 我最好还是先想想再作决定。 We …
并列连词both…and…与neither…nor…的用法说明 一、both…and…的用法 both…and…的意思是“不仅……而且”“既……又”，用于连接两个性质相同的词或短语。如： She both speaks and writes Swahili. 她不仅会说斯瓦西里语，而且还会写。 Tonight they will both sing and dance. 今晚他们将又唱歌又跳舞。 We visited both New York and London. 我们不但访问了纽约，还访问了伦敦。 The s…
并列连词so的用法说明 so用作并列连词时主要表示结果，意为“因此”“所以”。如： I was tired, so I went to bed earlier. 我累了所以早点睡了。 He took my shoes, so I couldn’t leave the house. 他把鞋拿走了，我出不了门。 It was very cold, so we had to wear warm clothes. 天气很冷，所以我们得穿暖和的衣服。 按英语习惯，表示结果的so不能与表示原因的because套用，在使用时只能…