英语(四年级下)主要知识点整理(例句都是课本中原句)1. 祈使句:表示请求、命令、建议等的句子。祈使句不需要主语,谓语动词用原形,句子末尾一般用感叹号。eg: (1) Dont walk on the grass! (否定祈使句)(2) Lets make a newspaper! (肯定祈使句)2. 一般现在时:经常发生的动作或状态 (常与always, usually, often, sometimes, seldom, never, every day/week/year, on Sundays .连用)(1) be动词的一般现在时:(比较简单) I am, We/You/They are, He/She/It is,There is+单数名词或不可数名词, There are + 复数名词eg: Its not beautiful, but its helpful.(2) 行为动词的一般现在时:(单数第三人称的变化是重点、易错点; 助动词用do, dont, does, doesnt)eg: (1)This