Modals of advice, necessity, obligation and prohibition

1
Modals of advice, necessity, obligation and
prohibition

• MUST / HAVE TO ? obligation
• You must arrive on time.
• NEEDNT / DONT HAVE TO ? there is no obligation
• You neednt pay for everything on a date.
• NEED TO ? necessity
• I need to buy my boyfriend a present today.
• MUSTNT ? prohibition
• You mustnt cheat on your boy or girlfriend.

2
Modals of advice, necessity, obligation and
prohibition

• OUGHT TO / SHOULD ? to give advice and make
  recommendations
• You ought to dress smartly.
• You should go to the doctor if you dont feel
  well.
• HAD BETTER ? to give advice or express an
  intention / threats
• You had better apologize to her.
• I feel terrible! I had better not go out.
• You had better not be late, or Ill be furious!