Unit 5

Unit 5

1. Uses of the infinitive

   • To say why you do something

2. Uses of the ing form

   • as the subject of a sentence
   • after some verbs
   • after prepositions

3. Have to

   • necessary

4. expressing movement

   • Use a verb of movement
   • preposition of movement

5. Don't have to

   • no obligation

6. must

   • obligations

7. must not

   • prohibited

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