by、at的用法复习知识点精析精练
摘要: by、at的用法复习知识点精析精练1、Bybyprep.乘……。用来表示方式，其后的名词为单数，且不加冠词。例如：bybike/......
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by、at的用法复习知识点精析精练 1、By by prep. 乘……。用来表示方式，其后的名词为单数，且不加冠词。例如： by bike/bus/ car /taxi/train//road/railway/land/boat/ship/ water/ sea/plane/air 但：“步行”用on foot. 注意：若表示交通工具的名词前有限定词，则将by 改作in 或on. in one’s/the car/ bus/plane etc. on the bike by name 该介宾词组的意思是“名叫……”；“凭名字”。如： ①He met a man, John by name. ②I knew him only by name. by one’s first marriage 通过或由于某人的第一次婚姻 介词by有许多含义，在此处意为“通过”，相当于through。He left by the first train.他乘第一次列车离开了。 The electricity supply is operated by a switch.供电由一个开关控制。 by the age of/at the age of,by到……时为止。表示的是一段时间，句子通常用完成时态。 2、At at在……时候。表示的是具体时间点，句子通常用一般时态。 ①By the age of ten,he had learned to play the piano.10岁的时候，他就学会了弹钢琴。 ②He was very clever.and at the age of 15 he went to college.他非常聪明，15岁时上大学了。 ③By the end of this term,we’ll have learned 2000 English words.到本学期末，我们将学会2000个英语单词。 ④At the end of this term,we’ll hold an English party.在本学期末，我们将举行一次英语晚会. 1. Children’s brains can’t develop properly they lack protein A when B since C because D unless 2. the two are only days apart in age，they seem to belong to wholly different generatioas. A While B If C As D.Since 3.—They don’t have much in their house yet. 一 they’planning to live here only until Bob gets his degree，they don’t want to buy much furniture. A.Since B While C Although D Aslong as 4.Love is just a word someone ecomes along and gives it meaning. A.if B.until C after D when 5.All people, they are old or young，rich or poor，have been trying their best to help those in need since the disaster A even if B whether C no matter D however 1 A。【解析】本题中when引导的是一个条件状语从句，相当于if。句意：如果孩子缺少蛋白质，他们的大脑就会发育不良}， 2 A。【解析】考查连词while的用法。句意：尽管这两个人的年龄只有几天之差，但是看起来完全不像是一代人。 3 D。【解析】考查连词since的用法。根据题意可 知，此处表原因，故答案选D。 4 B。【解析】untill直到…为止。句意：爱只是一个字，直到某人出现并给予它真正的内涵。 5 B。【解析】考查固定措配whether……or……的用法，句意：自从那次灾难以后，所有的人，不论老人还是年轻人、富人还是穷人，都在努力帮助那些需要帮助的人。 
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