English verb conjugation
COULD GROIN

Regular verb: groin - groined - groined

Affirmation

Simple form	V-ing form
I could groin you could groin he could groin we could groin you could groin they could groin	I could be groining you could be groining he could be groining we could be groining you could be groining they could be groining
Perfect	V-ing perfect
I could have groined you could have groined he could have groined we could have groined you could have groined they could have groined	I could have been groining you could have been groining he could have been groining we could have been groining you could have been groining they could have been groining

Negation

Simple form	V-ing form
I couldn't groin you couldn't groin he couldn't groin we couldn't groin you couldn't groin they couldn't groin	I couldn't be groining you couldn't be groining he couldn't be groining we couldn't be groining you couldn't be groining they couldn't be groining
Perfect	V-ing perfect
I couldn't have groined you couldn't have groined he couldn't have groined we couldn't have groined you couldn't have groined they couldn't have groined	I couldn't have been groining you couldn't have been groining he couldn't have been groining we couldn't have been groining you couldn't have been groining they couldn't have been groining

Interrogative form

Simple form	V-ing form
could I groin? could you groin? could he groin? could we groin? could you groin? could they groin?	could I be groining? could you be groining? could he be groining? could we be groining? could you be groining? could they be groining?
Perfect	V-ing perfect
could I have groined? could you have groined? could he have groined? could we have groined? could you have groined? could they have groined?	could I have been groining? could you have been groining? could he have been groining? could we have been groining? could you have been groining? could they have been groining?

Interro-negative form

Simple form	V-ing form
couldn't I groin? couldn't you groin? couldn't he groin? couldn't we groin? couldn't you groin? couldn't they groin?	couldn't I be groining? couldn't you be groining? couldn't he be groining? couldn't we be groining? couldn't you be groining? couldn't they be groining?
Perfect	V-ing perfect
couldn't I have groined? couldn't you have groined? couldn't he have groined? couldn't we have groined? couldn't you have groined? couldn't they have groined?	couldn't I have been groining? couldn't you have been groining? couldn't he have been groining? couldn't we have been groining? couldn't you have been groining? couldn't they have been groining?