English verb conjugation
COULD PROTEST

Regular verb: protest - protested - protested

Affirmation

Simple form	V-ing form
I could protest you could protest she could protest we could protest you could protest they could protest	I could be protesting you could be protesting she could be protesting we could be protesting you could be protesting they could be protesting
Perfect	V-ing perfect
I could have protested you could have protested she could have protested we could have protested you could have protested they could have protested	I could have been protesting you could have been protesting she could have been protesting we could have been protesting you could have been protesting they could have been protesting

Negation

Simple form	V-ing form
I couldn't protest you couldn't protest she couldn't protest we couldn't protest you couldn't protest they couldn't protest	I couldn't be protesting you couldn't be protesting she couldn't be protesting we couldn't be protesting you couldn't be protesting they couldn't be protesting
Perfect	V-ing perfect
I couldn't have protested you couldn't have protested she couldn't have protested we couldn't have protested you couldn't have protested they couldn't have protested	I couldn't have been protesting you couldn't have been protesting she couldn't have been protesting we couldn't have been protesting you couldn't have been protesting they couldn't have been protesting

Interrogative form

Simple form	V-ing form
could I protest? could you protest? could she protest? could we protest? could you protest? could they protest?	could I be protesting? could you be protesting? could she be protesting? could we be protesting? could you be protesting? could they be protesting?
Perfect	V-ing perfect
could I have protested? could you have protested? could she have protested? could we have protested? could you have protested? could they have protested?	could I have been protesting? could you have been protesting? could she have been protesting? could we have been protesting? could you have been protesting? could they have been protesting?

Interro-negative form

Simple form	V-ing form
couldn't I protest? couldn't you protest? couldn't she protest? couldn't we protest? couldn't you protest? couldn't they protest?	couldn't I be protesting? couldn't you be protesting? couldn't she be protesting? couldn't we be protesting? couldn't you be protesting? couldn't they be protesting?
Perfect	V-ing perfect
couldn't I have protested? couldn't you have protested? couldn't she have protested? couldn't we have protested? couldn't you have protested? couldn't they have protested?	couldn't I have been protesting? couldn't you have been protesting? couldn't she have been protesting? couldn't we have been protesting? couldn't you have been protesting? couldn't they have been protesting?