English verb conjugation
COULD APPROXIMATE

Regular verb: approximate - approximated - approximated

Affirmation

Simple form	V-ing form
I could approximate you could approximate she could approximate we could approximate you could approximate they could approximate	I could be approximating you could be approximating she could be approximating we could be approximating you could be approximating they could be approximating
Perfect	V-ing perfect
I could have approximated you could have approximated she could have approximated we could have approximated you could have approximated they could have approximated	I could have been approximating you could have been approximating she could have been approximating we could have been approximating you could have been approximating they could have been approximating

Negation

Simple form	V-ing form
I couldn't approximate you couldn't approximate she couldn't approximate we couldn't approximate you couldn't approximate they couldn't approximate	I couldn't be approximating you couldn't be approximating she couldn't be approximating we couldn't be approximating you couldn't be approximating they couldn't be approximating
Perfect	V-ing perfect
I couldn't have approximated you couldn't have approximated she couldn't have approximated we couldn't have approximated you couldn't have approximated they couldn't have approximated	I couldn't have been approximating you couldn't have been approximating she couldn't have been approximating we couldn't have been approximating you couldn't have been approximating they couldn't have been approximating

Interrogative form

Simple form	V-ing form
could I approximate? could you approximate? could she approximate? could we approximate? could you approximate? could they approximate?	could I be approximating? could you be approximating? could she be approximating? could we be approximating? could you be approximating? could they be approximating?
Perfect	V-ing perfect
could I have approximated? could you have approximated? could she have approximated? could we have approximated? could you have approximated? could they have approximated?	could I have been approximating? could you have been approximating? could she have been approximating? could we have been approximating? could you have been approximating? could they have been approximating?

Interro-negative form

Simple form	V-ing form
couldn't I approximate? couldn't you approximate? couldn't she approximate? couldn't we approximate? couldn't you approximate? couldn't they approximate?	couldn't I be approximating? couldn't you be approximating? couldn't she be approximating? couldn't we be approximating? couldn't you be approximating? couldn't they be approximating?
Perfect	V-ing perfect
couldn't I have approximated? couldn't you have approximated? couldn't she have approximated? couldn't we have approximated? couldn't you have approximated? couldn't they have approximated?	couldn't I have been approximating? couldn't you have been approximating? couldn't she have been approximating? couldn't we have been approximating? couldn't you have been approximating? couldn't they have been approximating?