English verb conjugation
COULD COLLATE

Regular verb: collate - collated - collated

Affirmation

Simple form	V-ing form
I could collate you could collate she could collate we could collate you could collate they could collate	I could be collating you could be collating she could be collating we could be collating you could be collating they could be collating
Perfect	V-ing perfect
I could have collated you could have collated she could have collated we could have collated you could have collated they could have collated	I could have been collating you could have been collating she could have been collating we could have been collating you could have been collating they could have been collating

Negation

Simple form	V-ing form
I couldn't collate you couldn't collate she couldn't collate we couldn't collate you couldn't collate they couldn't collate	I couldn't be collating you couldn't be collating she couldn't be collating we couldn't be collating you couldn't be collating they couldn't be collating
Perfect	V-ing perfect
I couldn't have collated you couldn't have collated she couldn't have collated we couldn't have collated you couldn't have collated they couldn't have collated	I couldn't have been collating you couldn't have been collating she couldn't have been collating we couldn't have been collating you couldn't have been collating they couldn't have been collating

Interrogative form

Simple form	V-ing form
could I collate? could you collate? could she collate? could we collate? could you collate? could they collate?	could I be collating? could you be collating? could she be collating? could we be collating? could you be collating? could they be collating?
Perfect	V-ing perfect
could I have collated? could you have collated? could she have collated? could we have collated? could you have collated? could they have collated?	could I have been collating? could you have been collating? could she have been collating? could we have been collating? could you have been collating? could they have been collating?

Interro-negative form

Simple form	V-ing form
couldn't I collate? couldn't you collate? couldn't she collate? couldn't we collate? couldn't you collate? couldn't they collate?	couldn't I be collating? couldn't you be collating? couldn't she be collating? couldn't we be collating? couldn't you be collating? couldn't they be collating?
Perfect	V-ing perfect
couldn't I have collated? couldn't you have collated? couldn't she have collated? couldn't we have collated? couldn't you have collated? couldn't they have collated?	couldn't I have been collating? couldn't you have been collating? couldn't she have been collating? couldn't we have been collating? couldn't you have been collating? couldn't they have been collating?