English verb conjugation
COULD SUMMATE

Regular verb: summate - summated - summated

Affirmation

Simple form	V-ing form
I could summate you could summate he could summate we could summate you could summate they could summate	I could be summating you could be summating he 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 he 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 he 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 he 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 he 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 he 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 he 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 he summate? could we summate? could you summate? could they summate?	could I be summating? could you be summating? could he 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 he 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 he 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 he 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 he 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 he 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 he have been summating? couldn't we have been summating? couldn't you have been summating? couldn't they have been summating?