English verb conjugation
CAN BASE

Regular verb: base - based - based

Affirmation

Simple form	V-ing form
I can base you can base she can base we can base you can base they can base	I can be basing you can be basing she can be basing we can be basing you can be basing they can be basing
Perfect	V-ing perfect
I can have based you can have based she can have based we can have based you can have based they can have based	I can have been basing you can have been basing she can have been basing we can have been basing you can have been basing they can have been basing

Negation

Simple form	V-ing form
I cannot base you cannot base she cannot base we cannot base you cannot base they cannot base	I cannot be basing you cannot be basing she cannot be basing we cannot be basing you cannot be basing they cannot be basing
Perfect	V-ing perfect
I cannot have based you cannot have based she cannot have based we cannot have based you cannot have based they cannot have based	I cannot have been basing you cannot have been basing she cannot have been basing we cannot have been basing you cannot have been basing they cannot have been basing

Interrogative form

Simple form	V-ing form
can I base? can you base? can she base? can we base? can you base? can they base?	can I be basing? can you be basing? can she be basing? can we be basing? can you be basing? can they be basing?
Perfect	V-ing perfect
can I have based? can you have based? can she have based? can we have based? can you have based? can they have based?	can I have been basing? can you have been basing? can she have been basing? can we have been basing? can you have been basing? can they have been basing?

Interro-negative form

Simple form	V-ing form
can I not base? can you not base? can she not base? can we not base? can you not base? can they not base?	can I not be basing? can you not be basing? can she not be basing? can we not be basing? can you not be basing? can they not be basing?
Perfect	V-ing perfect
can I not have based? can you not have based? can she not have based? can we not have based? can you not have based? can they not have based?	can I not have been basing? can you not have been basing? can she not have been basing? can we not have been basing? can you not have been basing? can they not have been basing?