English verb conjugation
MUST TREAD

Irregular verb: tread - trod - trod, trodden

Affirmation

Simple form	V-ing form
I must tread you must tread he must tread we must tread you must tread they must tread	I must be treading you must be treading he must be treading we must be treading you must be treading they must be treading
Perfect	V-ing perfect
I must have trod, trodden you must have trod, trodden he must have trod, trodden we must have trod, trodden you must have trod, trodden they must have trod, trodden	I must have been treading you must have been treading he must have been treading we must have been treading you must have been treading they must have been treading

Negation

Simple form	V-ing form
I must not tread you must not tread he must not tread we must not tread you must not tread they must not tread	I must not be treading you must not be treading he must not be treading we must not be treading you must not be treading they must not be treading
Perfect	V-ing perfect
I must not have trod, trodden you must not have trod, trodden he must not have trod, trodden we must not have trod, trodden you must not have trod, trodden they must not have trod, trodden	I must not have been treading you must not have been treading he must not have been treading we must not have been treading you must not have been treading they must not have been treading

Interrogative form

Simple form	V-ing form
must I tread? must you tread? must he tread? must we tread? must you tread? must they tread?	must I be treading? must you be treading? must he be treading? must we be treading? must you be treading? must they be treading?
Perfect	V-ing perfect
must I have trod, trodden? must you have trod, trodden? must he have trod, trodden? must we have trod, trodden? must you have trod, trodden? must they have trod, trodden?	must I have been treading? must you have been treading? must he have been treading? must we have been treading? must you have been treading? must they have been treading?

Interro-negative form

Simple form	V-ing form
must I not tread? must you not tread? must he not tread? must we not tread? must you not tread? must they not tread?	must I not be treading? must you not be treading? must he not be treading? must we not be treading? must you not be treading? must they not be treading?
Perfect	V-ing perfect
must I not have trod, trodden? must you not have trod, trodden? must he not have trod, trodden? must we not have trod, trodden? must you not have trod, trodden? must they not have trod, trodden?	must I not have been treading? must you not have been treading? must he not have been treading? must we not have been treading? must you not have been treading? must they not have been treading?