Period Ⅱ Using language——Grammar & Vocabulary Grammar(情态动词二)课前自主预习[观察句子,总结规律]①That is why Letters from Father Christmas could be the perfect book
②The children must have been very excited as they opened it
they might not receive their presents if they were not good
[我的发现]以上三个句子都使用了情态动词
(1)① 句中的 could 表示过去的能力,意为“________”
(2)② 句中的 must 表示十分肯定的推测,意为“________”
(3)③ 句中的 might 表示推测(把握不大),意为“________”,多用于肯定句和否定句
答案:(1)能够 (2)一定;准是 (3)可能精讲课时语法一、情态动词 can 与 could 的用法1.表示能力:can 多用于指现在或将来,could 多用于指过去
I can play basketball now, but I couldn't when I was young
现在我会打篮球了,但小时候我不会
2.表示请求和许可:could 语气比 can 委婉,但回答时只能用 can
Can/Could you lend me a hand
你能帮我一下吗
3.表示推测,意为“可能”
多用于否定句或疑问句
只是 could 语气较委婉,含义较不确定
—Can he be in the reading room now
—No,he can't be in it
Because I saw him in the off