1st and 2nd conditionals
Adjectives and adverbs
Conjunctions and prepositions
Future perfect continuous
Ing and infinitive
Past perfect continuous
Present perfect pcntinuous
Pronouns and determiners
Questions and auxiliary verbs
Simple future will
The phone is ringing. It ... be Tim.
If you are tired, we ... go home now.
The weather is very bad now but it ... get better later.
You have been driving all day. You ... be very tired.
Take an umbrella. It ... rain later in the evening.
b) has to
Simon ... go to hospital yesterday.
a) had to
You look tired. You ... go to bed.
b) are to
You ... do it. I've already done it.
a) need not
b) must not
c) ought not
I'm so tired I ..... for a month.
a) can sleep
b) could sleep
c) could have slept
The story ..... be true, but I don't think it is.
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