English verb conjugation
COULD GROAN

Regular verb: groan - groaned - groaned

Affirmation

Simple form	V-ing form
I could groan you could groan he could groan we could groan you could groan they could groan	I could be groaning you could be groaning he could be groaning we could be groaning you could be groaning they could be groaning
Perfect	V-ing perfect
I could have groaned you could have groaned he could have groaned we could have groaned you could have groaned they could have groaned	I could have been groaning you could have been groaning he could have been groaning we could have been groaning you could have been groaning they could have been groaning

Negation

Simple form	V-ing form
I could not groan you could not groan he could not groan we could not groan you could not groan they could not groan	I could not be groaning you could not be groaning he could not be groaning we could not be groaning you could not be groaning they could not be groaning
Perfect	V-ing perfect
I could not have groaned you could not have groaned he could not have groaned we could not have groaned you could not have groaned they could not have groaned	I could not have been groaning you could not have been groaning he could not have been groaning we could not have been groaning you could not have been groaning they could not have been groaning

Interrogative form

Simple form	V-ing form
could I groan? could you groan? could he groan? could we groan? could you groan? could they groan?	could I be groaning? could you be groaning? could he be groaning? could we be groaning? could you be groaning? could they be groaning?
Perfect	V-ing perfect
could I have groaned? could you have groaned? could he have groaned? could we have groaned? could you have groaned? could they have groaned?	could I have been groaning? could you have been groaning? could he have been groaning? could we have been groaning? could you have been groaning? could they have been groaning?

Interro-negative form

Simple form	V-ing form
could I not groan? could you not groan? could he not groan? could we not groan? could you not groan? could they not groan?	could I not be groaning? could you not be groaning? could he not be groaning? could we not be groaning? could you not be groaning? could they not be groaning?
Perfect	V-ing perfect
could I not have groaned? could you not have groaned? could he not have groaned? could we not have groaned? could you not have groaned? could they not have groaned?	could I not have been groaning? could you not have been groaning? could he not have been groaning? could we not have been groaning? could you not have been groaning? could they not have been groaning?