English verb conjugation
CAN TREAD

Irregular verb: tread - trod - trod, trodden

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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