English verb conjugation
COULD SCAB

Regular verb: scab - scabbed - scabbed

Affirmation

Simple form	V-ing form
I could scab you could scab he could scab we could scab you could scab they could scab	I could be scabbing you could be scabbing he could be scabbing we could be scabbing you could be scabbing they could be scabbing
Perfect	V-ing perfect
I could have scabbed you could have scabbed he could have scabbed we could have scabbed you could have scabbed they could have scabbed	I could have been scabbing you could have been scabbing he could have been scabbing we could have been scabbing you could have been scabbing they could have been scabbing

Negation

Simple form	V-ing form
I couldn't scab you couldn't scab he couldn't scab we couldn't scab you couldn't scab they couldn't scab	I couldn't be scabbing you couldn't be scabbing he couldn't be scabbing we couldn't be scabbing you couldn't be scabbing they couldn't be scabbing
Perfect	V-ing perfect
I couldn't have scabbed you couldn't have scabbed he couldn't have scabbed we couldn't have scabbed you couldn't have scabbed they couldn't have scabbed	I couldn't have been scabbing you couldn't have been scabbing he couldn't have been scabbing we couldn't have been scabbing you couldn't have been scabbing they couldn't have been scabbing

Interrogative form

Simple form	V-ing form
could I scab? could you scab? could he scab? could we scab? could you scab? could they scab?	could I be scabbing? could you be scabbing? could he be scabbing? could we be scabbing? could you be scabbing? could they be scabbing?
Perfect	V-ing perfect
could I have scabbed? could you have scabbed? could he have scabbed? could we have scabbed? could you have scabbed? could they have scabbed?	could I have been scabbing? could you have been scabbing? could he have been scabbing? could we have been scabbing? could you have been scabbing? could they have been scabbing?

Interro-negative form

Simple form	V-ing form
couldn't I scab? couldn't you scab? couldn't he scab? couldn't we scab? couldn't you scab? couldn't they scab?	couldn't I be scabbing? couldn't you be scabbing? couldn't he be scabbing? couldn't we be scabbing? couldn't you be scabbing? couldn't they be scabbing?
Perfect	V-ing perfect
couldn't I have scabbed? couldn't you have scabbed? couldn't he have scabbed? couldn't we have scabbed? couldn't you have scabbed? couldn't they have scabbed?	couldn't I have been scabbing? couldn't you have been scabbing? couldn't he have been scabbing? couldn't we have been scabbing? couldn't you have been scabbing? couldn't they have been scabbing?