高中英语模块四unit2的ppt1课件牛津版必修4 课件VIP免费

牛津高中英语牛津高中英语( 模块四 · 高一下学期 )Grammar and usage 板块：教学设计—课件UnitUnit22课件描述： 通过对情态动词的介绍来帮助学生学习掌握情态动词。情态动词没有人称和数的变化，有词义，但是不完整，不能单独做谓语，必须和不带 to 的动词不定式连用。abilitycertaintypermissionobligation make requests make suggestions make offers give advice 能力义务 ,责任确定允许 提出请求 提出建议提供帮忙提出忠告Modal verbs: general introduction(1)He can run the 100m sprint in 11 seconds.(2)Can this little girl read before she goes to the primary school?ability• can 表示可能性时，指的是理论上的可能，它通常不用来表示某事实际发生的可能性或真实性。如： • Accidents can happen ． Anybody can make mistakes ．can / be able tocan/be able toability•在过去时态的肯定句中需要某种条件或努力做成某事，我们要用 was ／ were able to 而不能用 could 。如： •It was a holiday and the children were able to go to the seaside ． •The girl worked hard so she was able to pass the final test ．•I’m sorry I haven’t been able to play tennis with you recently.obligationought to/should•ought to 与 should 意思接近，大多数情况下二者可以互换，但是 should 谈的是自己的主观看法 , 用于各种人称。 ought to 则更多反映客观情况，在谈到法律、义务和规定时使用。如： •We should ／ ought to help each other and learn from each other in our work ．•You shouldn’t spend so much time playing. •She is your mother, so you ought to support her． •Ought he to go? Yes, I think he ought (to) .have to/mustobligation must 与 have to 都可以表示“必须”的意思，但要注意以下两点区别。 1) must 只有现在时，而 have to 有现在时、过去时和将来时。如： We must work hard, or we’ll fail in the examination ． Two years ago, the poor girl had to leave school for lack of money ． 2) must 表示主观看法， have to 则侧重于客观需要。如： W...