English verb conjugation
COULD INFILL

Regular verb: infill - infilled - infilled

Affirmation

Simple form	V-ing form
I could infill you could infill she could infill we could infill you could infill they could infill	I could be infilling you could be infilling she 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 she 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 she 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 she 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 she 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 she 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 she 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 she infill? could we infill? could you infill? could they infill?	could I be infilling? could you be infilling? could she 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 she 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 she 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 she 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 she 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 she 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 she have been infilling? couldn't we have been infilling? couldn't you have been infilling? couldn't they have been infilling?