English verb conjugation
COULD CRAB

Regular verb: crab - crabbed - crabbed

Affirmation

Simple form	V-ing form
I could crab you could crab he could crab we could crab you could crab they could crab	I could be crabbing you could be crabbing he could be crabbing we could be crabbing you could be crabbing they could be crabbing
Perfect	V-ing perfect
I could have crabbed you could have crabbed he could have crabbed we could have crabbed you could have crabbed they could have crabbed	I could have been crabbing you could have been crabbing he could have been crabbing we could have been crabbing you could have been crabbing they could have been crabbing

Negation

Simple form	V-ing form
I couldn't crab you couldn't crab he couldn't crab we couldn't crab you couldn't crab they couldn't crab	I couldn't be crabbing you couldn't be crabbing he couldn't be crabbing we couldn't be crabbing you couldn't be crabbing they couldn't be crabbing
Perfect	V-ing perfect
I couldn't have crabbed you couldn't have crabbed he couldn't have crabbed we couldn't have crabbed you couldn't have crabbed they couldn't have crabbed	I couldn't have been crabbing you couldn't have been crabbing he couldn't have been crabbing we couldn't have been crabbing you couldn't have been crabbing they couldn't have been crabbing

Interrogative form

Simple form	V-ing form
could I crab? could you crab? could he crab? could we crab? could you crab? could they crab?	could I be crabbing? could you be crabbing? could he be crabbing? could we be crabbing? could you be crabbing? could they be crabbing?
Perfect	V-ing perfect
could I have crabbed? could you have crabbed? could he have crabbed? could we have crabbed? could you have crabbed? could they have crabbed?	could I have been crabbing? could you have been crabbing? could he have been crabbing? could we have been crabbing? could you have been crabbing? could they have been crabbing?

Interro-negative form

Simple form	V-ing form
couldn't I crab? couldn't you crab? couldn't he crab? couldn't we crab? couldn't you crab? couldn't they crab?	couldn't I be crabbing? couldn't you be crabbing? couldn't he be crabbing? couldn't we be crabbing? couldn't you be crabbing? couldn't they be crabbing?
Perfect	V-ing perfect
couldn't I have crabbed? couldn't you have crabbed? couldn't he have crabbed? couldn't we have crabbed? couldn't you have crabbed? couldn't they have crabbed?	couldn't I have been crabbing? couldn't you have been crabbing? couldn't he have been crabbing? couldn't we have been crabbing? couldn't you have been crabbing? couldn't they have been crabbing?