EXPRESSING OBLIGATION MUST You must study hard to

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EXPRESSING OBLIGATION «MUST»

EXPRESSING OBLIGATION «MUST»

 You must study hard to pass your class.

You must study hard to pass your class.

 It is cold. You must put on your coat.

It is cold. You must put on your coat.

 My grandfather is very ill. He must see a doctor.

My grandfather is very ill. He must see a doctor.

 This book is great. Everybody must read it.

This book is great. Everybody must read it.

 This ice-cream is wonderful. She must taste it.

This ice-cream is wonderful. She must taste it.

EXPRESSING PROHIBITION «MUSTN’T» You mustn’t go to bed late.

EXPRESSING PROHIBITION «MUSTN’T» You mustn’t go to bed late.

 Your father is driving very fast. He mustn’t drive fast.

Your father is driving very fast. He mustn’t drive fast.

 You mustn’t talk in the library.

You mustn’t talk in the library.

 We mustn’t pollute the environment.

We mustn’t pollute the environment.

Rewrite the sentences using must / mustn’t 1. Don’t use pesticides on farms. We

Rewrite the sentences using must / mustn’t 1. Don’t use pesticides on farms. We mustn’t… 2. Don’t destroy rainforests. 3. Use solar energy.

 4. Don’t use fossil fuels. 5. Save water and energy. 6. Recycle paper,

4. Don’t use fossil fuels. 5. Save water and energy. 6. Recycle paper, bottles and glass.

Write sentences with «must» and «mustn’t» Bob is overweight. (go on a diet/ eat

Write sentences with «must» and «mustn’t» Bob is overweight. (go on a diet/ eat fast food) What must he do? What mustn’t he do?

 The children are in the library. ( be quiet / make noise)

The children are in the library. ( be quiet / make noise)

 The students are having an exam. ( answer all the questions / cheat)

The students are having an exam. ( answer all the questions / cheat)

 Susan is driving. ( obey the rules / drive fast)

Susan is driving. ( obey the rules / drive fast)

 Tony and Jack are playing volleyball. ( pass the ball over the net

Tony and Jack are playing volleyball. ( pass the ball over the net / touch the net)

 You are in the forest. ( cut down trees / make a fire)

You are in the forest. ( cut down trees / make a fire)

Are you environmentally-friendly?

Are you environmentally-friendly?

must or mustn’t 1. We _____ throw bottles in the recycling bin. 2. We

must or mustn’t 1. We _____ throw bottles in the recycling bin. 2. We _____ turn of the tap when we don’t need water. 3. We _____ protect the environment. 4. We _____ leave the television on all the time. 5. We _____ use solar energy. 6. We _____ recycle paper, bottles and glass. 7. We _____waste water or electricity. 8. We _____ walk to the places nearby. 9. We _____ pollute the environment. 10. We _____ prefer public transportation. 11. We _____ cut down trees. 12. We _____ waste materials and natural resources.

Fill in the blanks with must/mustn’t and a verb plant / recycle / use

Fill in the blanks with must/mustn’t and a verb plant / recycle / use / turn off / cut down/ pollute / use / throw 1. We ________ environment-friendly perfumes. 2. We ________ our environment. 3. We ________ the tap while we are brushing our teeth. 4. We _______ the materials like paper, glass and plastic. 5. We ________ rubbish into sea. 6. We ________ the trees. 7. We ________ new trees. 8. We ________ solar energy.