6.4.3 Grammar Spot - Could

Verb To Can in the past Could
Positive
I could have a car
You couldhave a car
He/ She/It couldhave a car
We could have a car
You could have a car
They could have a car

NB! In positive sentences could is the same for all persons and in positive, negative and question is always followed by the infinitive (without to).
 
Negative
I could not have/ I could 't have (a car)
You could not have/ You could 't have (a car)
He/ She/ It could not have / He/ She/ It could 't have (a car)
We could not have/ We could 't have (a car)
You could not have/ You could 't have (a car)
They could not have/ They could 't have ( a car) 
 
NB! In negative sentences couldn't is the same for all persons and there is no do or does.

Subject -
could - not - verb in infinitive form without "to".
 
Question
Could I have (a car)?
Could you have (a car)?
Could he/ she/ it have (a car)?
Could we have (a car)?
Could you have (a car)?
Could they have (a car)?
 
Auxiliar - could - verb in infinitive form without "to".
 
Negative Question
Could not/ Couldn't I have (a car)?
Could not/ Couldn't you have (a car)?
Could not/ Couldn't he/ she/ it have (a car)?
Could not/ Couldn't we have (a car)?
Could not/ Couldn't you have (a car)?
Could not/ Couldn't they have (a car)?
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