牛津英语语法 情态动词幻灯片.ppt

You shouldnt eat meat.;We use words have to, must, should and ought to to show that it is necessary or important to do something. ;You shouldnt eat meat. So, they have to be given drugs. You did not have to eat that! We should use land to grow food for people instead of cattle. You ought to eat some salad instead. ;Modal verb (情态动词）;Negative must not = something is not allowed do not have to =something that is not necessary ;We use should and ought to when we feel that it is important to do something, or to give advice. Should --- 强调个人主观看法 Ought to --- 强调客观因素 所以在表示建议的时候， should 的语气更强 ;;比较must, have to, 和should/ ought to 所表示的不同意义 ;;S1: I ve got spots on my face. S2: Then you have to take more Vitamin A. S1: Where can I get it? S2: From green vegetables.;;Jumping;