English verb conjugation
COULD SWAB

Regular verb: swab - swabed - swabed

Affirmation

Simple form	V-ing form
I could swab you could swab he could swab we could swab you could swab they could swab	I could be swabing you could be swabing he could be swabing we could be swabing you could be swabing they could be swabing
Perfect	V-ing perfect
I could have swabed you could have swabed he could have swabed we could have swabed you could have swabed they could have swabed	I could have been swabing you could have been swabing he could have been swabing we could have been swabing you could have been swabing they could have been swabing

Negation

Simple form	V-ing form
I couldn't swab you couldn't swab he couldn't swab we couldn't swab you couldn't swab they couldn't swab	I couldn't be swabing you couldn't be swabing he couldn't be swabing we couldn't be swabing you couldn't be swabing they couldn't be swabing
Perfect	V-ing perfect
I couldn't have swabed you couldn't have swabed he couldn't have swabed we couldn't have swabed you couldn't have swabed they couldn't have swabed	I couldn't have been swabing you couldn't have been swabing he couldn't have been swabing we couldn't have been swabing you couldn't have been swabing they couldn't have been swabing

Interrogative form

Simple form	V-ing form
could I swab? could you swab? could he swab? could we swab? could you swab? could they swab?	could I be swabing? could you be swabing? could he be swabing? could we be swabing? could you be swabing? could they be swabing?
Perfect	V-ing perfect
could I have swabed? could you have swabed? could he have swabed? could we have swabed? could you have swabed? could they have swabed?	could I have been swabing? could you have been swabing? could he have been swabing? could we have been swabing? could you have been swabing? could they have been swabing?

Interro-negative form

Simple form	V-ing form
couldn't I swab? couldn't you swab? couldn't he swab? couldn't we swab? couldn't you swab? couldn't they swab?	couldn't I be swabing? couldn't you be swabing? couldn't he be swabing? couldn't we be swabing? couldn't you be swabing? couldn't they be swabing?
Perfect	V-ing perfect
couldn't I have swabed? couldn't you have swabed? couldn't he have swabed? couldn't we have swabed? couldn't you have swabed? couldn't they have swabed?	couldn't I have been swabing? couldn't you have been swabing? couldn't he have been swabing? couldn't we have been swabing? couldn't you have been swabing? couldn't they have been swabing?