I ought to tread you ought to tread he ought to tread we ought to tread you ought to tread they ought to tread
V-ing form
I ought to be treading you ought to be treading he ought to be treading we ought to be treading you ought to be treading they ought to be treading
Perfect
I ought to have trod, trodden you ought to have trod, trodden he ought to have trod, trodden we ought to have trod, trodden you ought to have trod, trodden they ought to have trod, trodden
V-ing perfect
I ought to have been treading you ought to have been treading he ought to have been treading we ought to have been treading you ought to have been treading they ought to have been treading
Negation
Simple form
I ought not to tread you ought not to tread he ought not to tread we ought not to tread you ought not to tread they ought not to tread
V-ing form
I ought not to treading you ought not to treading he ought not to treading we ought not to treading you ought not to treading they ought not to treading
Perfect
I ought not to have trod, trodden you ought not to have trod, trodden he ought not to have trod, trodden we ought not to have trod, trodden you ought not to have trod, trodden they ought not to have trod, trodden
V-ing perfect
I ought not to have been treading you ought not to have been treading he ought not to have been treading we ought not to have been treading you ought not to have been treading they ought not to have been treading
Interrogative form
Simple form
ought to I tread? ought to you tread? ought to he tread? ought to we tread? ought to you tread? ought to they tread?
V-ing form
ought to I be treading? ought to you be treading? ought to he be treading? ought to we be treading? ought to you be treading? ought to they be treading?
Perfect
ought to I have trod, trodden? ought to you have trod, trodden? ought to he have trod, trodden? ought to we have trod, trodden? ought to you have trod, trodden? ought to they have trod, trodden?
V-ing perfect
ought to I have been treading? ought to you have been treading? ought to he have been treading? ought to we have been treading? ought to you have been treading? ought to they have been treading?
Interro-negative form
Simple form
ought I not to tread? ought you not to tread? ought he not to tread? ought we not to tread? ought you not to tread? ought they not to tread?
V-ing form
ought I not to be treading? ought you not to be treading? ought he not to be treading? ought we not to be treading? ought you not to be treading? ought they not to be treading?
Perfect
ought I not to have trod, trodden? ought you not to have trod, trodden? ought he not to have trod, trodden? ought we not to have trod, trodden? ought you not to have trod, trodden? ought they not to have trod, trodden?
V-ing perfect
ought I not to have been treading? ought you not to have been treading? ought he not to have been treading? ought we not to have been treading? ought you not to have been treading? ought they not to have been treading?