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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