English verb conjugation
COULD EXPRESS

Regular verb: express - expressed - expressed

Affirmation

Simple form	V-ing form
I could express you could express he could express we could express you could express they could express	I could be expressing you could be expressing he could be expressing we could be expressing you could be expressing they could be expressing
Perfect	V-ing perfect
I could have expressed you could have expressed he could have expressed we could have expressed you could have expressed they could have expressed	I could have been expressing you could have been expressing he could have been expressing we could have been expressing you could have been expressing they could have been expressing

Negation

Simple form	V-ing form
I could not express you could not express he could not express we could not express you could not express they could not express	I could not be expressing you could not be expressing he could not be expressing we could not be expressing you could not be expressing they could not be expressing
Perfect	V-ing perfect
I could not have expressed you could not have expressed he could not have expressed we could not have expressed you could not have expressed they could not have expressed	I could not have been expressing you could not have been expressing he could not have been expressing we could not have been expressing you could not have been expressing they could not have been expressing

Interrogative form

Simple form	V-ing form
could I express? could you express? could he express? could we express? could you express? could they express?	could I be expressing? could you be expressing? could he be expressing? could we be expressing? could you be expressing? could they be expressing?
Perfect	V-ing perfect
could I have expressed? could you have expressed? could he have expressed? could we have expressed? could you have expressed? could they have expressed?	could I have been expressing? could you have been expressing? could he have been expressing? could we have been expressing? could you have been expressing? could they have been expressing?

Interro-negative form

Simple form	V-ing form
could I not express? could you not express? could he not express? could we not express? could you not express? could they not express?	could I not be expressing? could you not be expressing? could he not be expressing? could we not be expressing? could you not be expressing? could they not be expressing?
Perfect	V-ing perfect
could I not have expressed? could you not have expressed? could he not have expressed? could we not have expressed? could you not have expressed? could they not have expressed?	could I not have been expressing? could you not have been expressing? could he not have been expressing? could we not have been expressing? could you not have been expressing? could they not have been expressing?