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1、三年级下册知识点总结1.主语+be+形容词进行描述：描述人：①I'm(very)shy.（我（非常）害羞。）②He's/She's/It's(very)tall.（他/她/它（特别）高。）He's/She's/It'snottall.（他/她/它不高。）③You're/You're/We're/They're(very）loud.（你/你们/我们/他们（非常）吵。）You're/You're/We're/They'renotloud.（你/你们/我们/他们不吵。）④Ishe/she/it(very)tall?（他/她/它非常高吗？）---Yes,he/she/itis.（是的，他/她/
2、它非常高。）/No, he/she/itisn't. （不是，他/她/它不高。）⑤Areyou/you/we /they(very) loud?（你/你们/我们/他们（非常）吵吗？）---Yes,Iam /weare /weare/theyare.（是的，我 /我们 /我们/他们（非常）吵。）/No, I'mnot /wearen't /wearen't/theyaren't. （不，我 /我们/我们/他们不吵。）（句子中的主语可以用名字或不同的人代替，代替时注意第三人称单数+is，复数主语+are，例如：Amy,Sam,Students,girls,boys,ducks... 形容词
3、也可以用我们学习过的进行替换，例如：quiet,helpful,nice,clever,naughty,lazy,young,old,thin,fat... ；very 是非常，abit 是有一些，也可以互换练习，注意意思的区别哦~）描述物：⑥Theriverisverylong.（这条河非常长。）⑦Istheriverlong?（这条河长吗？）---Yes,itis.（是的，它很长。）/No,itisn't.（不是，它不长。）⑧Thebagsareheavy.（这些包是重的。）⑨Arethebagsheavy?（这些包重吗？）---Yes,theyare.（是的，它们很重。）/No,
4、theyaren't.（不是，它们不重。）（描述物与描述人结构相同，注意单复数和is,are的对应关系，形容词有long,short,big,small,new,old...）2. be的过去式：① am,is的过去式为 was, are的过去式为were（was,were与人称的对应关系，见文末附录）主语+be的过去式+形容词描述人：②I/He/She/It was short.（我/他/她/它曾经很矮。）I/He/She/It wasn't naughty.（我/他/她/它以前不淘气。）③You/You/We/They were happy.（你/你们/我们/他们曾经是开心的。）Y
5、ou /You/We/They weren't worried. （你/你们/我们/他们之前不担心。）主语+be的过去式+介词短语表示所在位置：④ I/He/She/It was inBeijing.（我/他/她/它之前在北京。）I/He/She/It wasn't inLondon. （我/他/她/它之前不在伦敦。）⑤ You /You/We/They were inWashington.（你/你们/我们/他们之前在华盛顿。）You /You/We/They weren'tin England. （你/你们/我们/他们之前不在英格兰。）be的过去式引导一般疑问句：⑥ Was I/he
6、/she/itnaughty?（我/他/她/它曾经淘气吗？）---Yes,you were /he was /she was /it was.（是的，你/他/她/它淘气。）/No,you weren't /he wasn't/she wasn't /it wasn't. （不，你/他/她/它不淘气。）⑦ Were you/you/we/theyonthesecondfloor?（你/你们/我们/他们之前在二楼吗？）---Yes,I was /we were /we were /they were.（是的，我/我们/我们/他们之前在二楼。）/No,I wasn't/we weren't
7、/we weren't /they weren't. （不，我/我们/我们/他们之前不在二楼。）⑧ Where‘smyfish? It was hereyesterday.（我的鱼（现在）在哪呀？它昨天在这呀。）⑨Wherearemy apples? They were onthefirstflooryesterday. （我的苹果（现在）在哪呀？它们昨天在一楼呀。）（wasn't=wasnot,weren't=werenot）3.询问数字（数
