English verb conjugation
MUST SUBTEND

Regular verb: subtend - subtended - subtended

Affirmation

Simple form	V-ing form
I must subtend you must subtend he must subtend we must subtend you must subtend they must subtend	I must be subtending you must be subtending he must be subtending we must be subtending you must be subtending they must be subtending
Perfect	V-ing perfect
I must have subtended you must have subtended he must have subtended we must have subtended you must have subtended they must have subtended	I must have been subtending you must have been subtending he must have been subtending we must have been subtending you must have been subtending they must have been subtending

Negation

Simple form	V-ing form
I must not subtend you must not subtend he must not subtend we must not subtend you must not subtend they must not subtend	I must not be subtending you must not be subtending he must not be subtending we must not be subtending you must not be subtending they must not be subtending
Perfect	V-ing perfect
I must not have subtended you must not have subtended he must not have subtended we must not have subtended you must not have subtended they must not have subtended	I must not have been subtending you must not have been subtending he must not have been subtending we must not have been subtending you must not have been subtending they must not have been subtending

Interrogative form

Simple form	V-ing form
must I subtend? must you subtend? must he subtend? must we subtend? must you subtend? must they subtend?	must I be subtending? must you be subtending? must he be subtending? must we be subtending? must you be subtending? must they be subtending?
Perfect	V-ing perfect
must I have subtended? must you have subtended? must he have subtended? must we have subtended? must you have subtended? must they have subtended?	must I have been subtending? must you have been subtending? must he have been subtending? must we have been subtending? must you have been subtending? must they have been subtending?

Interro-negative form

Simple form	V-ing form
must I not subtend? must you not subtend? must he not subtend? must we not subtend? must you not subtend? must they not subtend?	must I not be subtending? must you not be subtending? must he not be subtending? must we not be subtending? must you not be subtending? must they not be subtending?
Perfect	V-ing perfect
must I not have subtended? must you not have subtended? must he not have subtended? must we not have subtended? must you not have subtended? must they not have subtended?	must I not have been subtending? must you not have been subtending? must he not have been subtending? must we not have been subtending? must you not have been subtending? must they not have been subtending?