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Present Form = Past Form 
   Can     = Could 
   May    = Might 
  Will     = Would 
             Shall = Should
              Must= - 
        Ought to= - 
Need     = - 

1. Could + Verb base

 To offer suggestions or possibility.
Example:
Rio       : Oh, no! I left my shorts.
William : Don’t worry, Rio. You could borrow my shorts.
Dimas   : I’m having trouble with English.
Mazhar : Why don’t you ask Agnes? Perhaps she could help you.


 To indicate that the ability existed in the past but doesn’t exist now.
Example:
Siska    : Dhe, can you climb the durian tree?
Dhea    : Well… I could climb durian tree when I was so young. But I think I’m too heavy to climb it.
Rika       : Grandpa, what could you do when you were younger?
Grandpa : When I was younger, I could swim across the big river very well and faster.
 

To express polite requests.
Example:
* Could I borrow your book, please ?
* Could you lend me your cloth now ?
* Could you please close the window ?
* Could you pass the sugar ?
 

 
2. Would + Verb base
 
For an action that was repeated regularly in the past
Example:
* When I was a child, I would visit my grandparents every weekend.
* On Sundays, when I was a child, we would all get up early and go fishing.
 

Insert rather into the pattern and use this expression to express preferences.
Example:
Nalendro : What would you rather do in the weekend, go to the party or stay home?
Tommy    : I would rather go to the party than stay home.
Riana       : Which country would you rather visit?
Thesa      : I would rather visit Italia than Somalia.
 

To express polite requests.
Example:
Arief       : Would you mind cycling with me, Agra ?
Agra       : No, not at all. It would be nice.
Trithalia  : Would you please pass the helmet, Novina ?
Novina   : No problem.
 

 
3. Should + Verb base
 
To give definite advice (advisability).
Example:
Nadya   : Lina, you should study tonight. You will have English test tomorrow, won’t you?
Lina       : I will, Nadya.
Ollyf      : You should paint your door, Dimas. It looks terrible.
Dimas    : Yes, I know I should.
 

To express the subject’s obligation or duty
Example:
* You should practice for more than an hour. (to musical friend)
* They shouldn’t allow parking here; the street is too narrow.
* Application should be sent before March 25th.
 

 
4. Might + Verb base
 
To tell possibilities
Example:
Thea   : Where is Aulia ?
Yanty : He might be in the studio with Ollyf.

 
To express polite requests
Example:
Deffi  : Might I borrow your coat?
Dwi   : I’m afraid not. It has been brought by Donny for weeks and I don’t know when he’ll return it.


 
When do we use modals ?
* To talk about someone's ability (or inability) to do something
Example:
"We can find your house without the street plan."
"She can't have a daughter that old!"

* To talk about an action that is necessary (or impossible, or not necessary)
Example:
"You must always have your driver's licence when you are driving your car."
"You needn't carry your passport around with you."

* To talk about a situation that is possible (or impossible)
Example:
"Do be careful with that glass, the baby might knock it over"

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