English verb conjugation
COULD INFILL

Regular verb: infill - infilled - infilled

Affirmation

Simple form	V-ing form
I could infill you could infill he could infill we could infill you could infill they could infill	I could be infilling you could be infilling he could be infilling we could be infilling you could be infilling they could be infilling
Perfect	V-ing perfect
I could have infilled you could have infilled he could have infilled we could have infilled you could have infilled they could have infilled	I could have been infilling you could have been infilling he could have been infilling we could have been infilling you could have been infilling they could have been infilling

Negation

Simple form	V-ing form
I couldn't infill you couldn't infill he couldn't infill we couldn't infill you couldn't infill they couldn't infill	I couldn't be infilling you couldn't be infilling he couldn't be infilling we couldn't be infilling you couldn't be infilling they couldn't be infilling
Perfect	V-ing perfect
I couldn't have infilled you couldn't have infilled he couldn't have infilled we couldn't have infilled you couldn't have infilled they couldn't have infilled	I couldn't have been infilling you couldn't have been infilling he couldn't have been infilling we couldn't have been infilling you couldn't have been infilling they couldn't have been infilling

Interrogative form

Simple form	V-ing form
could I infill? could you infill? could he infill? could we infill? could you infill? could they infill?	could I be infilling? could you be infilling? could he be infilling? could we be infilling? could you be infilling? could they be infilling?
Perfect	V-ing perfect
could I have infilled? could you have infilled? could he have infilled? could we have infilled? could you have infilled? could they have infilled?	could I have been infilling? could you have been infilling? could he have been infilling? could we have been infilling? could you have been infilling? could they have been infilling?

Interro-negative form

Simple form	V-ing form
couldn't I infill? couldn't you infill? couldn't he infill? couldn't we infill? couldn't you infill? couldn't they infill?	couldn't I be infilling? couldn't you be infilling? couldn't he be infilling? couldn't we be infilling? couldn't you be infilling? couldn't they be infilling?
Perfect	V-ing perfect
couldn't I have infilled? couldn't you have infilled? couldn't he have infilled? couldn't we have infilled? couldn't you have infilled? couldn't they have infilled?	couldn't I have been infilling? couldn't you have been infilling? couldn't he have been infilling? couldn't we have been infilling? couldn't you have been infilling? couldn't they have been infilling?