English verb conjugation
MUST GROAN

Regular verb: groan - groaned - groaned

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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