Modals,imperative etc.

这是一篇关于Modals,imperative etc.的思维导图，包括might；can and could；must mustn't don't need to should；l have to...等词汇的用法。

Modals,imperative etc.

• might
  • It might rain.=it is possible that it will rain
  • might do
  • I might/I might not=it is possible that I will(not)
    • Rebecca is going to phone later.(sure)
    • Rebecca might phone later.(possible)
  • I may=I might
    • May I...=Is it ok to...?/Can I...?
• can and could
  • can do
  • I can do something=I know how to do it or it is possible for me to do it.
  • For the past,use could/couldn't
  • Can you ...?Could you...?when we ask people to do things.
    • Can I...?or Could I...?=is it ok to do something?
• must mustn't don't need to
  • must do
  • I must do something=I need to do it
    • For the past ,we use had to...(not must)
    • I mustn't do something=it is necessary not to do it,it is the wrong thing to do
      • Be happy!You mustn't be sad.(=don't be sad)
  • I don't need(to do something)=it is not necessary
• should
  • should do
  • You should do something=it is a good thing to do,it is the right thing to do
  • often say I think...should.../Do you think...should...?
  • must is stronger than should
  • another way to say should is ought to
• I have to...
  • I have to do something= it is necessary for me to do it,I am obliged to do it
  • the past is had to...
  • In questions and negatives we use do/does and did(past)
    • Do i have to...?
  • must and have to
    • use must or have to when you think is neceessary,when you give your opinion
      • when you are not giving your personal opinion,use have to(not must)
• Would you like....?I'd like...?
  • Would you like...?=Do you want...?
  • use Would you like to...?to invite somebody
    • answer I'd love to.
  • I'd like...is a polite way to say 'I want'.I'd like=I would like
  • Would you like...?/I'd like... and Do you like...?/I like...
    • Would you like some tea?=Do you want some tea?
      • Do yoou like tea?=Do you think tea is nice?
• imperative
  • Do this!
  • Don't do that!
  • Let's do this!
    • when you want people to do things with you.Let's=Let us.
• I used to...
  • Dave used to work in a factory.Now he works in a supermarket.
  • negative/didn't used to...
  • questions/did you used to...?
  • use used to...only for past