English verb conjugation
COULD SUMMATE

Regular verb: summate - summated - summated

Affirmation

Simple form	V-ing form
I could summate you could summate she could summate we could summate you could summate they could summate	I could be summating you could be summating she could be summating we could be summating you could be summating they could be summating
Perfect	V-ing perfect
I could have summated you could have summated she could have summated we could have summated you could have summated they could have summated	I could have been summating you could have been summating she could have been summating we could have been summating you could have been summating they could have been summating

Negation

Simple form	V-ing form
I couldn't summate you couldn't summate she couldn't summate we couldn't summate you couldn't summate they couldn't summate	I couldn't be summating you couldn't be summating she couldn't be summating we couldn't be summating you couldn't be summating they couldn't be summating
Perfect	V-ing perfect
I couldn't have summated you couldn't have summated she couldn't have summated we couldn't have summated you couldn't have summated they couldn't have summated	I couldn't have been summating you couldn't have been summating she couldn't have been summating we couldn't have been summating you couldn't have been summating they couldn't have been summating

Interrogative form

Simple form	V-ing form
could I summate? could you summate? could she summate? could we summate? could you summate? could they summate?	could I be summating? could you be summating? could she be summating? could we be summating? could you be summating? could they be summating?
Perfect	V-ing perfect
could I have summated? could you have summated? could she have summated? could we have summated? could you have summated? could they have summated?	could I have been summating? could you have been summating? could she have been summating? could we have been summating? could you have been summating? could they have been summating?

Interro-negative form

Simple form	V-ing form
couldn't I summate? couldn't you summate? couldn't she summate? couldn't we summate? couldn't you summate? couldn't they summate?	couldn't I be summating? couldn't you be summating? couldn't she be summating? couldn't we be summating? couldn't you be summating? couldn't they be summating?
Perfect	V-ing perfect
couldn't I have summated? couldn't you have summated? couldn't she have summated? couldn't we have summated? couldn't you have summated? couldn't they have summated?	couldn't I have been summating? couldn't you have been summating? couldn't she have been summating? couldn't we have been summating? couldn't you have been summating? couldn't they have been summating?