could tick
Regular verb: tick - ticked- ticked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could tick
you could tick
she could tick
we could tick
you could tick
they could tick 	I could be ticking
you could be ticking
she could be ticking
we could be ticking
you could be ticking
they could be ticking	I could have ticked
you could have ticked
she could have ticked
we could have ticked
you could have ticked
they could have ticked	I could have been ticking
you could have been ticking
she could have been ticking
we could have been ticking
you could have been ticking
they could have been ticking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't tick
you couldn't tick
she couldn't tick
we couldn't tick
you couldn't tick
they couldn't tick 	I couldn't be ticking
you couldn't be ticking
she couldn't be ticking
we couldn't be ticking
you couldn't be ticking
they couldn't be ticking	I couldn't have ticked
you couldn't have ticked
she couldn't have ticked
we couldn't have ticked
you couldn't have ticked
they couldn't have ticked	I couldn't have been ticking
you couldn't have been ticking
she couldn't have been ticking
we couldn't have been ticking
you couldn't have been ticking
they couldn't have been ticking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I tick?
could you tick?
could she tick?
could we tick?
could you tick?
could they tick? 	could I be ticking?
could you be ticking?
could she be ticking?
could we be ticking?
could you be ticking?
could they be ticking? 	could I have ticked?
could you have ticked?
could she have ticked?
could we have ticked?
could you have ticked?
could they have ticked? 	could I have been ticking?
could you have been ticking?
could she have been ticking?
could we have been ticking?
could you have been ticking?
could they have been ticking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I tick?
couldn't you tick?
couldn't she tick?
couldn't we tick?
couldn't you tick?
couldn't they tick? 	couldn't I be ticking?
couldn't you be ticking?
couldn't she be ticking?
couldn't we be ticking?
couldn't you be ticking?
couldn't they be ticking? 	couldn't I have ticked?
couldn't you have ticked?
couldn't she have ticked?
couldn't we have ticked?
couldn't you have ticked?
couldn't they have ticked? 	couldn't I have been ticking?
couldn't you have been ticking?
couldn't she have been ticking?
couldn't we have been ticking?
couldn't you have been ticking?
couldn't they have been ticking?