We will use these modal verbs (additionally referred to as modals of deduction, pens.ac.id hypothesis or certainty) once we want to make a guess about something. We select the verb relying on how certain we're.
1: Speaking about the current:
must / might / may / might / cannot + infinitive
- She must be on the bus. (I'm fairly certain this is an effective guess)
- She might come quickly. (maybe)
- She could possibly be misplaced. (perhaps)
- She may be in the mistaken room. (maybe)
- She can't be at house. (I'm pretty positive this is not true)
Notice that the opposite of 'must' is 'cannot on this case.
Will / will not
We use will and won't when we are very sure:
- She'll be at work now.
Ought to / should not
- They ought to be there by now.
- It shouldn't take long to drive right here.
- The underground will be very busy now (not: 'should be').
Can
- Costs will be high in London.
- He could possibly be on the bus (not: 'will be').
2: Using modal verbs to talk in regards to the previous:
must / may / may / may / cannot + have + previous participle
will need to have + previous participle
might / might not have + previous participle
might / couldn't have + past participle
may / could not have + past participle
cannot have + previous participle
- She will need to have forgotten about our date.
- She might need worked late.
- She could have taken the fallacious bus.
- She might have felt ailing.
- She can't have stayed at dwelling.
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