内容正文:
Unit 2 Let’s celebrate!
Period 2 Using language 知识点梳理
单元语法精讲精练-情态动词(二)
I.语法感知
感知以下课文原句,完成方框下的小题
1.That is why Letters from Father Christmas could be the perfect book...
2.The children must have been very excited as they opened it.
3.The letters were also beautifully illustrated—each must have taken its true author...
4.In another letter,Father Christmas complained about how he could not stop his helpers...
5.Interestingly,the letters did not contain the usual warnings to children that they might not...
6....we can all share the true spirit of giving at Christmas time.
1.以上句子中,句1、句4和句6中的情态动词表能力。
2.句5中的情态动词表可能性。
3.句2和句3中的情态动词表猜测,意思是“一定已经发生了”。
II.语法精析
1.can与could的用法
(1)表示能力(could是过去式)。
My grandmother can do some shopping on the Internet,but she couldn’t last year.
我奶奶会网购了,但是去年她还不会。
(2)表示猜测,意为“可能”,一般用于疑问句和否定句(could是过去式)。
Can this news be true?这则消息是真的吗?
(3)表示请求和许可(could表示更委婉的语气,回答时只能用can)。
—Can/Could I go now?
—Yes,you can.
——我现在可以走了吗?
——是的,可以。
(4)用于肯定的陈述句中,表示理论上或习惯上的可能性。
As we all kno