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