Using
Should:
One of the meanings of the modal auxiliary should is advisability:
--You
should leave right now.
--They should fill out this form. You
can also express the same idea using either ought to or had better:
--You
ought to leave right now.
(You had better leave....)
--They
ought to fill out this form.
(They had better fill out....)
Should
and ought to both mean that something is a good idea. Had better
is usually stronger, implying a warning of bad consequences.
The
negative of should is shouldn't. Ought to is not usually used in
the negative. Often you will hear people pronounce ought to as otta.
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