English verb conjugation
COULD TICK

Regular verb: tick - ticked - ticked

Affirmation

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