I ought to crab you ought to crab he ought to crab we ought to crab you ought to crab they ought to crab
V-ing form
I ought to be crabbing you ought to be crabbing he ought to be crabbing we ought to be crabbing you ought to be crabbing they ought to be crabbing
Perfect
I ought to have crabbed you ought to have crabbed he ought to have crabbed we ought to have crabbed you ought to have crabbed they ought to have crabbed
V-ing perfect
I ought to have been crabbing you ought to have been crabbing he ought to have been crabbing we ought to have been crabbing you ought to have been crabbing they ought to have been crabbing
Negation
Simple form
I oughtn't to crab you oughtn't to crab he oughtn't to crab we oughtn't to crab you oughtn't to crab they oughtn't to crab
V-ing form
I oughtn't to be crabbing you oughtn't to be crabbing he oughtn't to be crabbing we oughtn't to be crabbing you oughtn't to be crabbing they oughtn't to be crabbing
Perfect
I oughtn't to have crabbed you oughtn't to have crabbed he oughtn't to have crabbed we oughtn't to have crabbed you oughtn't to have crabbed they oughtn't to have crabbed
V-ing perfect
I oughtn't to have been crabbing you oughtn't to have been crabbing he oughtn't to have been crabbing we oughtn't to have been crabbing you oughtn't to have been crabbing they oughtn't to have been crabbing
Interrogative form
Simple form
ought to I crab? ought to you crab? ought to he crab? ought to we crab? ought to you crab? ought to they crab?
V-ing form
ought to I be crabbing? ought to you be crabbing? ought to he be crabbing? ought to we be crabbing? ought to you be crabbing? ought to they be crabbing?
Perfect
ought to I have crabbed? ought to you have crabbed? ought to he have crabbed? ought to we have crabbed? ought to you have crabbed? ought to they have crabbed?
V-ing perfect
ought to I have been crabbing? ought to you have been crabbing? ought to he have been crabbing? ought to we have been crabbing? ought to you have been crabbing? ought to they have been crabbing?
Interro-negative form
Simple form
oughtn't I to crab? oughtn't you to crab? oughtn't he to crab? oughtn't we to crab? oughtn't you to crab? oughtn't they to crab?
V-ing form
oughtn't I to be crabbing? oughtn't you to be crabbing? oughtn't he to be crabbing? oughtn't we to be crabbing? oughtn't you to be crabbing? oughtn't they to be crabbing?
Perfect
oughtn't I to have crabbed? oughtn't you to have crabbed? oughtn't he to have crabbed? oughtn't we to have crabbed? oughtn't you to have crabbed? oughtn't they to have crabbed?
V-ing perfect
oughtn't I to have been crabbing? oughtn't you to have been crabbing? oughtn't he to have been crabbing? oughtn't we to have been crabbing? oughtn't you to have been crabbing? oughtn't they to have been crabbing?