Thirteenth set is more about ‘Modals’; here they are detailed further how to form polite questions, ask permission, give instruction, to order, to make it compulsory with help of modals.

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3. Chapter 13 Modals Part II
CONTENTS
13-1 Using should
13-2 Using have + infinitive (have to/has to)
13-3 Using must
13-4 Polite questions: may I, could I, and can I
13-5 Polite questions: could you and would you
13-6 Imperative sentences
13-7 Modal auxiliaries
13-8 Summary chart: modal auxiliaries and similar…
13-9 Using let’s
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4. 13-1 USING SHOULD
My hair is very long.
I should cut it.
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5. 13-1 USING SHOULD
(a) My hair is very long. I should cut it.
(b) Ali is hungry. He should eat lunch.
(c) You are tired. You should go home.
should = This is a good idea.
(advice)
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6. 13-1 USING SHOULD
(d) I
You
She
He should go.
It
We
They
should + simple form of verb
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7. 13-1 USING SHOULD
(d) He should go.
He should goes. ?
He should to go. ?
should + simple form of verb
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8. 13-1 USING SHOULD
(e) You should not go out in the rain.
You will get wet.
(f) You shouldn’t go out in the rain.
NEGATIVE: should not
CONTRACTION: should + not = shouldn’t
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9. 13-1 Let’s Practice
wash them try harder
call your mother learn to drive
go to the library stop smoking
Your clothes are dirty.
You should ___________.
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10. 13-1 Let’s Practice
wash them try harder
call your mother learn to drive
go to the library stop smoking
Your mother called.
You should ___________.
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11. 13-1 Let’s Practice
wash them try harder
call your mother learn to drive
go to the library stop smoking
Your books are due.
You should ______________.
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12. 13-1 Let’s Practice
wash them try harder
call your mother learn to drive
go to the library stop smoking
Your car is new.
You should _____________.
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13. 13-1 Let’s Practice
wash them try harder
call your mother learn to drive
go to the library stop smoking
You are not trying hard.
You should _____________.
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14. 13-1 Let’s Practice
wash them try harder
call your mother learn to drive
go to the library stop smoking
Smoking is not healthy.
You should _____________.
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15. 13-2 USING HAVE + INFINITIVE (HAVE TO/HAS TO)
People need to drink water.
People have to drink water.
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16. 13-2 USING HAVE + INFINITIVE (HAVE TO/HAS TO)
(a) People need to drink water.
same
(b) People have to drink water. meaning
(c) Lance needs to work.
same
(d) Lance has to work. meaning
have + infinitive = need
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17. 13-2 USING HAVE + INFINITIVE (HAVE TO/HAS TO)
(e) I had to work yesterday.
PAST FORM: had + infinitive
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18. 13-2 USING HAVE + INFINITIVE (HAVE TO/HAS TO)
(f) Does she have to work tonight?
(g) What time do you have to work?
(h) Why did you have to work today?
QUESTION FORM:
do, does, did used with have to
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19. 13-2 USING HAVE + INFINITIVE (HAVE TO/HAS TO)
(i) I don’t have to work today.
He doesn’t have to go home.
(j) The bus was early.
We didn’t have to wait.
NEGATIVE FORM:
don’t, doesn’t, didn’t
used with have to
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20. 13-2 Let’s Practice
What do you have to do next week?
(click and type)
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