English verb conjugation
COULD DRAB

Regular verb: drab - drabed - drabed

Affirmation

Simple form	V-ing form
I could drab you could drab he could drab we could drab you could drab they could drab	I could be drabing you could be drabing he could be drabing we could be drabing you could be drabing they could be drabing
Perfect	V-ing perfect
I could have drabed you could have drabed he could have drabed we could have drabed you could have drabed they could have drabed	I could have been drabing you could have been drabing he could have been drabing we could have been drabing you could have been drabing they could have been drabing

Negation

Simple form	V-ing form
I couldn't drab you couldn't drab he couldn't drab we couldn't drab you couldn't drab they couldn't drab	I couldn't be drabing you couldn't be drabing he couldn't be drabing we couldn't be drabing you couldn't be drabing they couldn't be drabing
Perfect	V-ing perfect
I couldn't have drabed you couldn't have drabed he couldn't have drabed we couldn't have drabed you couldn't have drabed they couldn't have drabed	I couldn't have been drabing you couldn't have been drabing he couldn't have been drabing we couldn't have been drabing you couldn't have been drabing they couldn't have been drabing

Interrogative form

Simple form	V-ing form
could I drab? could you drab? could he drab? could we drab? could you drab? could they drab?	could I be drabing? could you be drabing? could he be drabing? could we be drabing? could you be drabing? could they be drabing?
Perfect	V-ing perfect
could I have drabed? could you have drabed? could he have drabed? could we have drabed? could you have drabed? could they have drabed?	could I have been drabing? could you have been drabing? could he have been drabing? could we have been drabing? could you have been drabing? could they have been drabing?

Interro-negative form

Simple form	V-ing form
couldn't I drab? couldn't you drab? couldn't he drab? couldn't we drab? couldn't you drab? couldn't they drab?	couldn't I be drabing? couldn't you be drabing? couldn't he be drabing? couldn't we be drabing? couldn't you be drabing? couldn't they be drabing?
Perfect	V-ing perfect
couldn't I have drabed? couldn't you have drabed? couldn't he have drabed? couldn't we have drabed? couldn't you have drabed? couldn't they have drabed?	couldn't I have been drabing? couldn't you have been drabing? couldn't he have been drabing? couldn't we have been drabing? couldn't you have been drabing? couldn't they have been drabing?