should / ought to have arrived
in Jakarta early this morning.
• The builders
should / ought to have finished
by the end of the week.
We can use
had better
instead of
should / ought to,
especially in spoken English, to say that we
think it would be sensible or advisable to do something. However, we don't use it to talk about
the past or to make general comments:
• If you're not well, you
should / ought to
ask Ann to go
(or
...you'd
better ask...)
•
You
should / ought to
have caught a later
(not
You had better have...)
• I don't think parents
should / ought to
give their children
(not
...had better...)
When we make a logical conclusion from some situation or activity, we use
must
not
should or
ought to
(for more on
must,
see Unit 23):
• You
must
be mad if you think I'm going to lend you any more money.
• • It's the third time she's been skating this week - she
must
really enjoy it.
We can use (be)
supposed to
instead of
should / ought to
to talk about an obligation to do
something. It is commonly used in spoken English to express a' less strong obligation:
•
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