English verb conjugation
COULD ALTERNATE

Regular verb: alternate - alternated - alternated

Affirmation

Simple form	V-ing form
I could alternate you could alternate he could alternate we could alternate you could alternate they could alternate	I could be alternating you could be alternating he could be alternating we could be alternating you could be alternating they could be alternating
Perfect	V-ing perfect
I could have alternated you could have alternated he could have alternated we could have alternated you could have alternated they could have alternated	I could have been alternating you could have been alternating he could have been alternating we could have been alternating you could have been alternating they could have been alternating

Negation

Simple form	V-ing form
I couldn't alternate you couldn't alternate he couldn't alternate we couldn't alternate you couldn't alternate they couldn't alternate	I couldn't be alternating you couldn't be alternating he couldn't be alternating we couldn't be alternating you couldn't be alternating they couldn't be alternating
Perfect	V-ing perfect
I couldn't have alternated you couldn't have alternated he couldn't have alternated we couldn't have alternated you couldn't have alternated they couldn't have alternated	I couldn't have been alternating you couldn't have been alternating he couldn't have been alternating we couldn't have been alternating you couldn't have been alternating they couldn't have been alternating

Interrogative form

Simple form	V-ing form
could I alternate? could you alternate? could he alternate? could we alternate? could you alternate? could they alternate?	could I be alternating? could you be alternating? could he be alternating? could we be alternating? could you be alternating? could they be alternating?
Perfect	V-ing perfect
could I have alternated? could you have alternated? could he have alternated? could we have alternated? could you have alternated? could they have alternated?	could I have been alternating? could you have been alternating? could he have been alternating? could we have been alternating? could you have been alternating? could they have been alternating?

Interro-negative form

Simple form	V-ing form
couldn't I alternate? couldn't you alternate? couldn't he alternate? couldn't we alternate? couldn't you alternate? couldn't they alternate?	couldn't I be alternating? couldn't you be alternating? couldn't he be alternating? couldn't we be alternating? couldn't you be alternating? couldn't they be alternating?
Perfect	V-ing perfect
couldn't I have alternated? couldn't you have alternated? couldn't he have alternated? couldn't we have alternated? couldn't you have alternated? couldn't they have alternated?	couldn't I have been alternating? couldn't you have been alternating? couldn't he have been alternating? couldn't we have been alternating? couldn't you have been alternating? couldn't they have been alternating?