I must engender you must engender he must engender we must engender you must engender they must engender
V-ing form
I must be engendering you must be engendering he must be engendering we must be engendering you must be engendering they must be engendering
Perfect
I must have engendered you must have engendered he must have engendered we must have engendered you must have engendered they must have engendered
V-ing perfect
I must have been engendering you must have been engendering he must have been engendering we must have been engendering you must have been engendering they must have been engendering
Negation
Simple form
I must not engender you must not engender he must not engender we must not engender you must not engender they must not engender
V-ing form
I must not be engendering you must not be engendering he must not be engendering we must not be engendering you must not be engendering they must not be engendering
Perfect
I must not have engendered you must not have engendered he must not have engendered we must not have engendered you must not have engendered they must not have engendered
V-ing perfect
I must not have been engendering you must not have been engendering he must not have been engendering we must not have been engendering you must not have been engendering they must not have been engendering
Interrogative form
Simple form
must I engender? must you engender? must he engender? must we engender? must you engender? must they engender?
V-ing form
must I be engendering? must you be engendering? must he be engendering? must we be engendering? must you be engendering? must they be engendering?
Perfect
must I have engendered? must you have engendered? must he have engendered? must we have engendered? must you have engendered? must they have engendered?
V-ing perfect
must I have been engendering? must you have been engendering? must he have been engendering? must we have been engendering? must you have been engendering? must they have been engendering?
Interro-negative form
Simple form
must I not engender? must you not engender? must he not engender? must we not engender? must you not engender? must they not engender?
V-ing form
must I not be engendering? must you not be engendering? must he not be engendering? must we not be engendering? must you not be engendering? must they not be engendering?
Perfect
must I not have engendered? must you not have engendered? must he not have engendered? must we not have engendered? must you not have engendered? must they not have engendered?
V-ing perfect
must I not have been engendering? must you not have been engendering? must he not have been engendering? must we not have been engendering? must you not have been engendering? must they not have been engendering?