English verb conjugation
CAN SOLVE

Regular verb: solve - solved - solved

Affirmation

Simple form	V-ing form
I can solve you can solve she can solve we can solve you can solve they can solve	I can be solving you can be solving she can be solving we can be solving you can be solving they can be solving
Perfect	V-ing perfect
I can have solved you can have solved she can have solved we can have solved you can have solved they can have solved	I can have been solving you can have been solving she can have been solving we can have been solving you can have been solving they can have been solving

Negation

Simple form	V-ing form
I cannot solve you cannot solve she cannot solve we cannot solve you cannot solve they cannot solve	I cannot be solving you cannot be solving she cannot be solving we cannot be solving you cannot be solving they cannot be solving
Perfect	V-ing perfect
I cannot have solved you cannot have solved she cannot have solved we cannot have solved you cannot have solved they cannot have solved	I cannot have been solving you cannot have been solving she cannot have been solving we cannot have been solving you cannot have been solving they cannot have been solving

Interrogative form

Simple form	V-ing form
can I solve? can you solve? can she solve? can we solve? can you solve? can they solve?	can I be solving? can you be solving? can she be solving? can we be solving? can you be solving? can they be solving?
Perfect	V-ing perfect
can I have solved? can you have solved? can she have solved? can we have solved? can you have solved? can they have solved?	can I have been solving? can you have been solving? can she have been solving? can we have been solving? can you have been solving? can they have been solving?

Interro-negative form

Simple form	V-ing form
can I not solve? can you not solve? can she not solve? can we not solve? can you not solve? can they not solve?	can I not be solving? can you not be solving? can she not be solving? can we not be solving? can you not be solving? can they not be solving?
Perfect	V-ing perfect
can I not have solved? can you not have solved? can she not have solved? can we not have solved? can you not have solved? can they not have solved?	can I not have been solving? can you not have been solving? can she not have been solving? can we not have been solving? can you not have been solving? can they not have been solving?