could graft
Regular verb: graft - grafted- grafted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could graft
you could graft
she could graft
we could graft
you could graft
they could graft 	I could be grafting
you could be grafting
she could be grafting
we could be grafting
you could be grafting
they could be grafting	I could have grafted
you could have grafted
she could have grafted
we could have grafted
you could have grafted
they could have grafted	I could have been grafting
you could have been grafting
she could have been grafting
we could have been grafting
you could have been grafting
they could have been grafting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't graft
you couldn't graft
she couldn't graft
we couldn't graft
you couldn't graft
they couldn't graft 	I couldn't be grafting
you couldn't be grafting
she couldn't be grafting
we couldn't be grafting
you couldn't be grafting
they couldn't be grafting	I couldn't have grafted
you couldn't have grafted
she couldn't have grafted
we couldn't have grafted
you couldn't have grafted
they couldn't have grafted	I couldn't have been grafting
you couldn't have been grafting
she couldn't have been grafting
we couldn't have been grafting
you couldn't have been grafting
they couldn't have been grafting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I graft?
could you graft?
could she graft?
could we graft?
could you graft?
could they graft? 	could I be grafting?
could you be grafting?
could she be grafting?
could we be grafting?
could you be grafting?
could they be grafting? 	could I have grafted?
could you have grafted?
could she have grafted?
could we have grafted?
could you have grafted?
could they have grafted? 	could I have been grafting?
could you have been grafting?
could she have been grafting?
could we have been grafting?
could you have been grafting?
could they have been grafting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I graft?
couldn't you graft?
couldn't she graft?
couldn't we graft?
couldn't you graft?
couldn't they graft? 	couldn't I be grafting?
couldn't you be grafting?
couldn't she be grafting?
couldn't we be grafting?
couldn't you be grafting?
couldn't they be grafting? 	couldn't I have grafted?
couldn't you have grafted?
couldn't she have grafted?
couldn't we have grafted?
couldn't you have grafted?
couldn't they have grafted? 	couldn't I have been grafting?
couldn't you have been grafting?
couldn't she have been grafting?
couldn't we have been grafting?
couldn't you have been grafting?
couldn't they have been grafting?