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 couldn't groan you couldn't groan he couldn't groan we couldn't groan you couldn't groan they couldn't groan	I couldn't be groaning you couldn't be groaning he couldn't be groaning we couldn't be groaning you couldn't be groaning they couldn't be groaning
Perfect	V-ing perfect
I couldn't have groaned you couldn't have groaned he couldn't have groaned we couldn't have groaned you couldn't have groaned they couldn't have groaned	I couldn't have been groaning you couldn't have been groaning he couldn't have been groaning we couldn't have been groaning you couldn't have been groaning they couldn't 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
couldn't I groan? couldn't you groan? couldn't he groan? couldn't we groan? couldn't you groan? couldn't they groan?	couldn't I be groaning? couldn't you be groaning? couldn't he be groaning? couldn't we be groaning? couldn't you be groaning? couldn't they be groaning?
Perfect	V-ing perfect
couldn't I have groaned? couldn't you have groaned? couldn't he have groaned? couldn't we have groaned? couldn't you have groaned? couldn't they have groaned?	couldn't I have been groaning? couldn't you have been groaning? couldn't he have been groaning? couldn't we have been groaning? couldn't you have been groaning? couldn't they have been groaning?