初高中英语语法情态动词课件.pptx

Modal verbs Must / have to / may / might / should / ought to / needn’t / will Obligation / necessity You must take your medicine. You have to / need to take your medicine. You should take your medicine. Must / should  present or future Have to  in all tenses I had to study for the test yesterday. I will have to find a new house soon. Lack of necessity I don’t have / don’t need to get up early today. I needn’t get up early today. Prohibition You mustn’t/ can’t/ may not smoke in the hospital. advice Possibility It may / might / can / could rain later. Permission May / Can / Might / Could I go out ? Request Can / Could / Will / Would you help me with the bags, please? certainty It must be abandoned. It can’t / couldn’t be inhabited. Offer Shall /May I help you? prediction The concert should / ought to / will start soon. Past Modal + have + past participle certainty He can’t have studied. prediction Peter hasn’t arrived yet. He may / might / could have missed the bus. Expectations not fulfilled I could have done better. I should have tried harder. I shouldn’t have made that stupid mistake. I would have bought the shoes, but I didn’t have enough money. Everything went fine. I needn’t have worried so much. We needn’t have gone. (but we went) We didn’t have to go. We didn’t need to go. (so we didn’t go)