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You ought to help your friend.

To indicate a moral obligation or duty.
She ought to study for the test.
They ought to be more careful.
He ought to apologize for his mistake.
ought to do
ought to be
ought to have
should
must
have to
You ought to help your friend.

Used to indicate duty or obligation.
You ought to study for the test.
She ought to apologize for her mistake.
They ought to respect their elders.
ought to be
ought to do
ought to have
should
must
have to