2. 1. SPECULATION (p. 146)
• Use should , must, can’t, might, could +
infinitive to make deductions about the
present or future.
They should help more.
Are you kidding? You can’t be serious
He must be Obama when he was a kid.
3. • Use should , must, can’t, might, could + have
to make deductions about the past.
4. Who killed Kennedy?
• It must have been a radical.
• It might have been an exlover.
• It couldn’t have been his wife. She was sitting
next to him.
5. What happened here?
• He may have received a call and he got
distracted.
• He must have been driving too fast.
• He should have been more careful.
6. Who built these statues?
• They must have been
built by local people
hundreds of years ago.
• They could have been
built by aliens.
• They may have been
built by giant people.
7. How did they move those big rocks to
build the pyramids?
• They must have
been moved by
slaves.
• They couldn’t have
been transported by
people. They were
too heavy!
14. 2. REGRETS (p. 142)
• Use SHOULD’VE/SHOULDN’T HAVE when you
did/didn’t something which you think was a
mistake.
They should’ve done something. They could’ve
saved his life.
• Add comments with COULD’VE/COULDN’T
HAVE, MIGHT’VE, WOULD’VE/WOULDN’T
HAVE.
Is it your birthday? You should’ve said. I
would’ve brought you a present.
