could grip
Regular verb: grip - gripped- gripped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could grip
you could grip
he could grip
we could grip
you could grip
they could grip 	I could be gripping
you could be gripping
he could be gripping
we could be gripping
you could be gripping
they could be gripping	I could have gripped
you could have gripped
he could have gripped
we could have gripped
you could have gripped
they could have gripped	I could have been gripping
you could have been gripping
he could have been gripping
we could have been gripping
you could have been gripping
they could have been gripping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't grip
you couldn't grip
he couldn't grip
we couldn't grip
you couldn't grip
they couldn't grip 	I couldn't be gripping
you couldn't be gripping
he couldn't be gripping
we couldn't be gripping
you couldn't be gripping
they couldn't be gripping	I couldn't have gripped
you couldn't have gripped
he couldn't have gripped
we couldn't have gripped
you couldn't have gripped
they couldn't have gripped	I couldn't have been gripping
you couldn't have been gripping
he couldn't have been gripping
we couldn't have been gripping
you couldn't have been gripping
they couldn't have been gripping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I grip?
could you grip?
could he grip?
could we grip?
could you grip?
could they grip? 	could I be gripping?
could you be gripping?
could he be gripping?
could we be gripping?
could you be gripping?
could they be gripping? 	could I have gripped?
could you have gripped?
could he have gripped?
could we have gripped?
could you have gripped?
could they have gripped? 	could I have been gripping?
could you have been gripping?
could he have been gripping?
could we have been gripping?
could you have been gripping?
could they have been gripping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I grip?
couldn't you grip?
couldn't he grip?
couldn't we grip?
couldn't you grip?
couldn't they grip? 	couldn't I be gripping?
couldn't you be gripping?
couldn't he be gripping?
couldn't we be gripping?
couldn't you be gripping?
couldn't they be gripping? 	couldn't I have gripped?
couldn't you have gripped?
couldn't he have gripped?
couldn't we have gripped?
couldn't you have gripped?
couldn't they have gripped? 	couldn't I have been gripping?
couldn't you have been gripping?
couldn't he have been gripping?
couldn't we have been gripping?
couldn't you have been gripping?
couldn't they have been gripping?