初中英语语法7个必考知识点

英语语法使用-介词 by 的用法-1、 意为“在……旁”，“靠近”。Some are singing and dancing under a big tree.Some are drawing by the lake.有的在大树下唱歌跳舞。有的在湖边画画儿。2、意为“不迟于”，“到……时为止”。Your son will be all right by supper time.你的儿子在晚饭前会好的。How many English songs had you learned by the end of last term？到上个学期末你们已经学了多少首英语歌曲？3、表示方法、手段，可译作“靠”、“用”、“凭借”、“通过”、“乘坐”等。The monkey was hanging from the tree by his tail and laughing.猴子用尾巴吊在树上哈哈大笑。The boy’s father was so thankful that he taught Edison how to send messages by railway telegraph.孩子的父亲是那么的感激，于是他教爱迪生怎样通过铁路电报来传达信息。4、表示“逐个”，“逐批”的意思。One by one they went past the table in the dark.他们一个一个得在黑暗中经过这张桌子。5、表示“根据”，“按照”的意思。What time is it by your watch？你的表几点了？6、和 take ， hold 等动词连用，说明接触身体的某一部分。I took him by the hand.我拉住了他的手。7、用于被动句中，表示行为主体，常译作“被”、“由”等。English is spoken by many people.英语被许多人说。（即“许多人讲英语。”）-动名词 doing-动名词相当于名词，在句子中可以做主语、宾语、表语、定语等。1、作主语Fighting broke out between the South and the North.南方与北方开战了。2、作宾语Would you mind turning down your radio a little， please？请问你介意调小一点收音机的音量吗？3、作表语Babysister’s job is washing，cooking and taking care of the children.保姆的工作是洗衣服，作饭和照看孩子。4、做定语a washing machine 一台洗衣机-used to 的用法-used to 意为过去常常做某事。1、肯定句：used 这个词没有人称的变化，to 后面接动词原形。否定句是 didn’t use to…。When I was a child， I didn’t use to like apples.当我还是孩子的时候我不喜欢苹果。疑问形式是 Did you use to…？Where did you use to live before you came here？当你来这儿之前你住哪儿？2...