English verb conjugation
COULD PREINSTILL

Regular verb: preinstill - preinstilled - preinstilled

Affirmation

Simple form	V-ing form
I could preinstill you could preinstill he could preinstill we could preinstill you could preinstill they could preinstill	I could be preinstilling you could be preinstilling he could be preinstilling we could be preinstilling you could be preinstilling they could be preinstilling
Perfect	V-ing perfect
I could have preinstilled you could have preinstilled he could have preinstilled we could have preinstilled you could have preinstilled they could have preinstilled	I could have been preinstilling you could have been preinstilling he could have been preinstilling we could have been preinstilling you could have been preinstilling they could have been preinstilling

Negation

Simple form	V-ing form
I couldn't preinstill you couldn't preinstill he couldn't preinstill we couldn't preinstill you couldn't preinstill they couldn't preinstill	I couldn't be preinstilling you couldn't be preinstilling he couldn't be preinstilling we couldn't be preinstilling you couldn't be preinstilling they couldn't be preinstilling
Perfect	V-ing perfect
I couldn't have preinstilled you couldn't have preinstilled he couldn't have preinstilled we couldn't have preinstilled you couldn't have preinstilled they couldn't have preinstilled	I couldn't have been preinstilling you couldn't have been preinstilling he couldn't have been preinstilling we couldn't have been preinstilling you couldn't have been preinstilling they couldn't have been preinstilling

Interrogative form

Simple form	V-ing form
could I preinstill? could you preinstill? could he preinstill? could we preinstill? could you preinstill? could they preinstill?	could I be preinstilling? could you be preinstilling? could he be preinstilling? could we be preinstilling? could you be preinstilling? could they be preinstilling?
Perfect	V-ing perfect
could I have preinstilled? could you have preinstilled? could he have preinstilled? could we have preinstilled? could you have preinstilled? could they have preinstilled?	could I have been preinstilling? could you have been preinstilling? could he have been preinstilling? could we have been preinstilling? could you have been preinstilling? could they have been preinstilling?

Interro-negative form

Simple form	V-ing form
couldn't I preinstill? couldn't you preinstill? couldn't he preinstill? couldn't we preinstill? couldn't you preinstill? couldn't they preinstill?	couldn't I be preinstilling? couldn't you be preinstilling? couldn't he be preinstilling? couldn't we be preinstilling? couldn't you be preinstilling? couldn't they be preinstilling?
Perfect	V-ing perfect
couldn't I have preinstilled? couldn't you have preinstilled? couldn't he have preinstilled? couldn't we have preinstilled? couldn't you have preinstilled? couldn't they have preinstilled?	couldn't I have been preinstilling? couldn't you have been preinstilling? couldn't he have been preinstilling? couldn't we have been preinstilling? couldn't you have been preinstilling? couldn't they have been preinstilling?