GENERAL RULES

DO NOT CHANGE FORM

• He musts speak English
• She shoulds arrive earlier

Use NOT to make negative

ALWAYS FOLLOW BY INFINITIVE

• EXCEPTIONS:OUGHT TO, HAVE TO
• I must be at home by 10

COULD

SHOULD/ OUGHT TO

MUST/HAVE TO

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• You could stop smoking
• You should stop smoking
• You must stop smoking

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