English verb conjugation
COULD PERFUSE

Regular verb: perfuse - perfused - perfused

Affirmation

Simple form	V-ing form
I could perfuse you could perfuse she could perfuse we could perfuse you could perfuse they could perfuse	I could be perfusing you could be perfusing she could be perfusing we could be perfusing you could be perfusing they could be perfusing
Perfect	V-ing perfect
I could have perfused you could have perfused she could have perfused we could have perfused you could have perfused they could have perfused	I could have been perfusing you could have been perfusing she could have been perfusing we could have been perfusing you could have been perfusing they could have been perfusing

Negation

Simple form	V-ing form
I couldn't perfuse you couldn't perfuse she couldn't perfuse we couldn't perfuse you couldn't perfuse they couldn't perfuse	I couldn't be perfusing you couldn't be perfusing she couldn't be perfusing we couldn't be perfusing you couldn't be perfusing they couldn't be perfusing
Perfect	V-ing perfect
I couldn't have perfused you couldn't have perfused she couldn't have perfused we couldn't have perfused you couldn't have perfused they couldn't have perfused	I couldn't have been perfusing you couldn't have been perfusing she couldn't have been perfusing we couldn't have been perfusing you couldn't have been perfusing they couldn't have been perfusing

Interrogative form

Simple form	V-ing form
could I perfuse? could you perfuse? could she perfuse? could we perfuse? could you perfuse? could they perfuse?	could I be perfusing? could you be perfusing? could she be perfusing? could we be perfusing? could you be perfusing? could they be perfusing?
Perfect	V-ing perfect
could I have perfused? could you have perfused? could she have perfused? could we have perfused? could you have perfused? could they have perfused?	could I have been perfusing? could you have been perfusing? could she have been perfusing? could we have been perfusing? could you have been perfusing? could they have been perfusing?

Interro-negative form

Simple form	V-ing form
couldn't I perfuse? couldn't you perfuse? couldn't she perfuse? couldn't we perfuse? couldn't you perfuse? couldn't they perfuse?	couldn't I be perfusing? couldn't you be perfusing? couldn't she be perfusing? couldn't we be perfusing? couldn't you be perfusing? couldn't they be perfusing?
Perfect	V-ing perfect
couldn't I have perfused? couldn't you have perfused? couldn't she have perfused? couldn't we have perfused? couldn't you have perfused? couldn't they have perfused?	couldn't I have been perfusing? couldn't you have been perfusing? couldn't she have been perfusing? couldn't we have been perfusing? couldn't you have been perfusing? couldn't they have been perfusing?