miércoles, 29 de mayo de 2013

CAN/COULD

Can

Can is an auxiliary verb, a modal auxiliary verb. We use can to:
  • talk about possibility and ability
  • make requests
  • ask for or give permission

Structure of Can

subject + can + main verb

The main verb is always the bare infinitive (infinitive without "to").



subject
auxiliary verb
main verb
+
I
can
play
tennis.
-
He
cannot
play
tennis.
can't
?
Can
you
play
tennis?



Could

Could is an auxiliary verb, a modal auxiliary verb. We use could to:
  • talk about past possibility or ability
  • make requests
Structure of Could

subject + could + main verb


The main verb is always the bare infinitive (infinitive without "to").
subject
auxiliary verb
main verb
+
My grandmother
could
swim.
-
She
could not
walk.
couldn't
?
Could
your grandmother
swim?


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