Must Have to Should Ought to

For Norms, Rules and Laws we use:

• MUST

• HAVE TO

• SHOULD

• OUGHT TO

For INTERNAL OBLIGATIONS we use:

• MUST

• HAVE TO

• SHOULD

• OUGHT TO

For EXTERNAL OBLIGATIONS we use:

• MUST

• HAVE TO

• SHOULD

When something is NOT NECESSARY we use:

• MUSTN'T

• DON'T HAVE TO

• SHOULDN'T

When something is FORBIDDEN we use:

• MUSTN'T

• DON'T HAVE TO

• SHOULDN'T

When we GIVE an ADVICE we use:

• MUST

• HAVE TO

• SHOULDN'T

• OUGHT TO

Students ________ wear a uniform.

• MUST

• HAVE TO

• SHOULD

Dogs ________ be kept on a lead.

• MUST

• HAVE TO

• SHOULD

Passengers ______ wear seatbelts.

• MUST

• HAVE TO

• SHOULD

If you can't read you _______ wear glasses.

• MUST

• HAVE TO

• SHOULD