人教版高中英语必修三unit2healthyeatingperiod2课件

人教版高中英语必修三unit2healthyeatingperiod2课件内容摘要：

tch the first train. • We missed the bus so we had to walk home. • We have to overe all kinds of difficulties. • Have to 有多种时态。 常见的有： • 一般将来时 • We will have to gather at the school gate at 7 tomorrow. • 一般现在时 • I have to take more money with me because my girlfriend has so much to buy. • 一般过去时 • Finally, we had to give up our idea to hold a piic outside as it rained for a whole afternoon. have to （考点） •Must they do…? Yes, they must. No, they needn’t/don’t have to. must amp。 have to must have to 主观／客观 主观 客观 时态 现在，将来 多种 表推测 √ 询问意愿 √ 否定意 禁止，不允许 不必 • must表主观意志，而 have to表由于客观因素不得不做完成的事情。 • Must没有过去式，除在间接引语中可表示过去的时间。 在直接引语中表示过去的时间用had to代替。 • I told her that she must give up smoking. • She said, “We had to get everything ready that night.” 比较 must amp。 have to Need I do …? Yes, you must. No, you needn’t. dare amp。 need 情态动词 实义动词 dare 否，疑，条 dare not do 否 ,疑 don’t dare to do don’t dare do 不用于肯定句 肯： dare to do need 否，疑 needn’t do (don’t) need sth (don’t) need to do 肯： must, have to, ought to, should 注意对 need问句的回答 : Need I finish the work today? Yes, ________________. No, ________________. No, ________________. you must you needn’t you don’t have to needn’t 对其它情态动词的回答 : Shall I tell John about it?。