English verb conjugation
CAN EXPRESS

Regular verb: express - expressed - expressed

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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