English verb conjugation
COULD TREAD

Irregular verb: tread - trod - trod, trodden

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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