could pet
Regular verb: pet - petted- petted

Affirmation 	
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I could pet
you could pet
she could pet
we could pet
you could pet
they could pet 	I could be petting
you could be petting
she could be petting
we could be petting
you could be petting
they could be petting	I could have petted
you could have petted
she could have petted
we could have petted
you could have petted
they could have petted	I could have been petting
you could have been petting
she could have been petting
we could have been petting
you could have been petting
they could have been petting	

Negation 	
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I couldn't pet
you couldn't pet
she couldn't pet
we couldn't pet
you couldn't pet
they couldn't pet 	I couldn't be petting
you couldn't be petting
she couldn't be petting
we couldn't be petting
you couldn't be petting
they couldn't be petting	I couldn't have petted
you couldn't have petted
she couldn't have petted
we couldn't have petted
you couldn't have petted
they couldn't have petted	I couldn't have been petting
you couldn't have been petting
she couldn't have been petting
we couldn't have been petting
you couldn't have been petting
they couldn't have been petting	

Interrogative form 	
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could I pet?
could you pet?
could she pet?
could we pet?
could you pet?
could they pet? 	could I be petting?
could you be petting?
could she be petting?
could we be petting?
could you be petting?
could they be petting? 	could I have petted?
could you have petted?
could she have petted?
could we have petted?
could you have petted?
could they have petted? 	could I have been petting?
could you have been petting?
could she have been petting?
could we have been petting?
could you have been petting?
could they have been petting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I pet?
couldn't you pet?
couldn't she pet?
couldn't we pet?
couldn't you pet?
couldn't they pet? 	couldn't I be petting?
couldn't you be petting?
couldn't she be petting?
couldn't we be petting?
couldn't you be petting?
couldn't they be petting? 	couldn't I have petted?
couldn't you have petted?
couldn't she have petted?
couldn't we have petted?
couldn't you have petted?
couldn't they have petted? 	couldn't I have been petting?
couldn't you have been petting?
couldn't she have been petting?
couldn't we have been petting?
couldn't you have been petting?
couldn't they have been petting?