English verb conjugation
COULD ASSUME

Regular verb: assume - assumed - assumed

Affirmation

Simple form	V-ing form
I could assume you could assume she could assume we could assume you could assume they could assume	I could be assuming you could be assuming she could be assuming we could be assuming you could be assuming they could be assuming
Perfect	V-ing perfect
I could have assumed you could have assumed she could have assumed we could have assumed you could have assumed they could have assumed	I could have been assuming you could have been assuming she could have been assuming we could have been assuming you could have been assuming they could have been assuming

Negation

Simple form	V-ing form
I couldn't assume you couldn't assume she couldn't assume we couldn't assume you couldn't assume they couldn't assume	I couldn't be assuming you couldn't be assuming she couldn't be assuming we couldn't be assuming you couldn't be assuming they couldn't be assuming
Perfect	V-ing perfect
I couldn't have assumed you couldn't have assumed she couldn't have assumed we couldn't have assumed you couldn't have assumed they couldn't have assumed	I couldn't have been assuming you couldn't have been assuming she couldn't have been assuming we couldn't have been assuming you couldn't have been assuming they couldn't have been assuming

Interrogative form

Simple form	V-ing form
could I assume? could you assume? could she assume? could we assume? could you assume? could they assume?	could I be assuming? could you be assuming? could she be assuming? could we be assuming? could you be assuming? could they be assuming?
Perfect	V-ing perfect
could I have assumed? could you have assumed? could she have assumed? could we have assumed? could you have assumed? could they have assumed?	could I have been assuming? could you have been assuming? could she have been assuming? could we have been assuming? could you have been assuming? could they have been assuming?

Interro-negative form

Simple form	V-ing form
couldn't I assume? couldn't you assume? couldn't she assume? couldn't we assume? couldn't you assume? couldn't they assume?	couldn't I be assuming? couldn't you be assuming? couldn't she be assuming? couldn't we be assuming? couldn't you be assuming? couldn't they be assuming?
Perfect	V-ing perfect
couldn't I have assumed? couldn't you have assumed? couldn't she have assumed? couldn't we have assumed? couldn't you have assumed? couldn't they have assumed?	couldn't I have been assuming? couldn't you have been assuming? couldn't she have been assuming? couldn't we have been assuming? couldn't you have been assuming? couldn't they have been assuming?