English verb conjugation
CAN GROAN

Regular verb: groan - groaned - groaned

Affirmation

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

Negation

Simple form	V-ing form
I can't groan you can't groan he can't groan we can't groan you can't groan they can't groan	I can't be groaning you can't be groaning he can't be groaning we can't be groaning you can't be groaning they can't be groaning
Perfect	V-ing perfect
I can't have groaned you can't have groaned he can't have groaned we can't have groaned you can't have groaned they can't have groaned	I can't have been groaning you can't have been groaning he can't have been groaning we can't have been groaning you can't have been groaning they can't have been groaning

Interrogative form

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

Interro-negative form

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