could unclasp
Regular verb: unclasp - unclasped- unclasped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could unclasp
you could unclasp
he could unclasp
we could unclasp
you could unclasp
they could unclasp 	I could be unclasping
you could be unclasping
he could be unclasping
we could be unclasping
you could be unclasping
they could be unclasping	I could have unclasped
you could have unclasped
he could have unclasped
we could have unclasped
you could have unclasped
they could have unclasped	I could have been unclasping
you could have been unclasping
he could have been unclasping
we could have been unclasping
you could have been unclasping
they could have been unclasping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't unclasp
you couldn't unclasp
he couldn't unclasp
we couldn't unclasp
you couldn't unclasp
they couldn't unclasp 	I couldn't be unclasping
you couldn't be unclasping
he couldn't be unclasping
we couldn't be unclasping
you couldn't be unclasping
they couldn't be unclasping	I couldn't have unclasped
you couldn't have unclasped
he couldn't have unclasped
we couldn't have unclasped
you couldn't have unclasped
they couldn't have unclasped	I couldn't have been unclasping
you couldn't have been unclasping
he couldn't have been unclasping
we couldn't have been unclasping
you couldn't have been unclasping
they couldn't have been unclasping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I unclasp?
could you unclasp?
could he unclasp?
could we unclasp?
could you unclasp?
could they unclasp? 	could I be unclasping?
could you be unclasping?
could he be unclasping?
could we be unclasping?
could you be unclasping?
could they be unclasping? 	could I have unclasped?
could you have unclasped?
could he have unclasped?
could we have unclasped?
could you have unclasped?
could they have unclasped? 	could I have been unclasping?
could you have been unclasping?
could he have been unclasping?
could we have been unclasping?
could you have been unclasping?
could they have been unclasping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I unclasp?
couldn't you unclasp?
couldn't he unclasp?
couldn't we unclasp?
couldn't you unclasp?
couldn't they unclasp? 	couldn't I be unclasping?
couldn't you be unclasping?
couldn't he be unclasping?
couldn't we be unclasping?
couldn't you be unclasping?
couldn't they be unclasping? 	couldn't I have unclasped?
couldn't you have unclasped?
couldn't he have unclasped?
couldn't we have unclasped?
couldn't you have unclasped?
couldn't they have unclasped? 	couldn't I have been unclasping?
couldn't you have been unclasping?
couldn't he have been unclasping?
couldn't we have been unclasping?
couldn't you have been unclasping?
couldn't they have been unclasping?