Exercise 3. Put the words in correct order.
1) reports / shown / caries / of /a/ incidence / worldwide / coronal/a/
have / number / decrease / of / the / in
2) problem / artificial / to /or / gum/this / be / sugarless / used / allevi-
ate / chewing / saliva / could
3) curtailed / must / snacking/ be / frequent
4) damaged / the / dentistry / a / restoration / of / general / be / teeth /of
/part / practice / should / of
5) appropriate / choice / sometimes / more / restorations / of /may/
restoration / a / be / extracoronal
6) welfare / dental / patient / and / restorations / health / enhance / the
can / the / of / general
1. Choose “may, can or could”:
Can you give me a hand with Geography, please?
I am sorry, I’m late. May I come in?
Sarah,may I use your mobile phone ?
2. Choose “must, should or have to”:
You are ill. You have to stay at the hospital for a week.
We must to study Maths properly, as we are to pass the exam.
You should do your homework regularly.
3. Choose “can, could or will be able to”:
My sister could read, when she was five years old.
He can speak German very well.
My cousin will be able to to drive a car in 3 months.
Объяснение:
2. We have not watched this film yet.
3. Have you been to the Russian Federation?
4. Tom has lost his keys lately.
5. Ann has not red this book yet.
6.Has she translated the text already?
Все предложение построены на основе времени Present Perfect. В 1 и 6, маркером этого времени является already. Во 2 и 5 маркёром этого времени является yet. В 4 маркёром этого времени является lately. А вот в 3 нет никаких маркеров, поэтому там нужно смотреть по ситуации, т.е. действие произошло в но имеет связь с настоящим.