2. z He could do some puzzles to improve
his memory.
You might try some tips for improving
your memory.
a. Use could and might to offer
suggestions and advice or give
choices.
3. z You might not want to start with
the most difficult math problem. Try
this one – it’s easier.
a. Might (not) is often used with
want to give suggestions.
4. z
Greg should improve his memory.
Kate shouldn’t spend so much time
doing crossword puzzles.
b. Use should to say something
is a good idea. Use shouldn’t to
say something is a bad idea.
5. z
We ought to take a memory class
together.
b. Ought to is also possible, but
less common. Ought not to is
rare in American English but
used more in British English.
6. z
You’d better pay attention now.
(Or you will be in trouble.
c. Use had better (not) only in
informal conversation to give
strong advice, especially as a
warning.
7. z
She had better not forget my
book again tomorrow. (Or I will
never lend her anything again.)
c. There is often a negative
consequence if the advice or
warning is not followed.
8. z
He’d better remember to bring his
ID next time.
c. Had is almost always
contracted, and often omitted in
informal conversation.