外研版高中英语必修4module5atripalongthethreegorgesgrammar2课件

外研版高中英语必修4module5atripalongthethreegorgesgrammar2课件内容摘要：

h you? 语气 强 弱 表许可 ,征询意见 can, will could / may / would / shall / might 三、表示许可 : may / might, can / could might, could 比较 委婉 , 一般多用于 疑问句。 can, may 表达的语言比较随便。 在以 could, might 表示 征求对方意见 或 表示请求 时，回答应相应使用 can, may。 must may, might, can, could 肯定句 语气 强 弱 表可能性 (推测 ) •There must be a mistake. •It can be true. •In those days few workers could support their families. •You may walk ten miles without seeing a house. •He might get there on time. Grammar3. Observation(2ms) 语气 强 弱 表不可能 (推测 ) can’t, couldn’t may not, might not 否定句 •She can’t be serious. •We couldn’t have done better. •People may not pick flowers in this garden. •She was afraid they might not like the idea. Grammar4. Observation(2ms) mustn’t, shouldn’t had better not 表禁止 •We mustn’t waste our time. •They shouldn’t leave so soon. •You’d better not disturb him. Grammar5. Observation(2ms) should, must have to 表义务 (应该 ) 有时态变化 Grammar6. Observation(3ms) •You should do what your parents tell you. •If you can’t finish the book by then, you must e and renew it. •This is a lovely party, but we have to go because of the babysister. •The bridge was not wide enough so that somebody had to give way. 1. 表示否定的情态动词的用法 : 部分情态动词的否定式是情态动词中的考点之一。 mustn’t 不准 , 禁止 needn’t 没必要 ( = don’t have to ) can’t。