I can elapse you can elapse she can elapse we can elapse you can elapse they can elapse
V-ing form
I can be elapsing you can be elapsing she can be elapsing we can be elapsing you can be elapsing they can be elapsing
Perfect
I can have elapsed you can have elapsed she can have elapsed we can have elapsed you can have elapsed they can have elapsed
V-ing perfect
I can have been elapsing you can have been elapsing she can have been elapsing we can have been elapsing you can have been elapsing they can have been elapsing
Negation
Simple form
I cannot elapse you cannot elapse she cannot elapse we cannot elapse you cannot elapse they cannot elapse
V-ing form
I cannot be elapsing you cannot be elapsing she cannot be elapsing we cannot be elapsing you cannot be elapsing they cannot be elapsing
Perfect
I cannot have elapsed you cannot have elapsed she cannot have elapsed we cannot have elapsed you cannot have elapsed they cannot have elapsed
V-ing perfect
I cannot have been elapsing you cannot have been elapsing she cannot have been elapsing we cannot have been elapsing you cannot have been elapsing they cannot have been elapsing
Interrogative form
Simple form
can I elapse? can you elapse? can she elapse? can we elapse? can you elapse? can they elapse?
V-ing form
can I be elapsing? can you be elapsing? can she be elapsing? can we be elapsing? can you be elapsing? can they be elapsing?
Perfect
can I have elapsed? can you have elapsed? can she have elapsed? can we have elapsed? can you have elapsed? can they have elapsed?
V-ing perfect
can I have been elapsing? can you have been elapsing? can she have been elapsing? can we have been elapsing? can you have been elapsing? can they have been elapsing?
Interro-negative form
Simple form
can I not elapse? can you not elapse? can she not elapse? can we not elapse? can you not elapse? can they not elapse?
V-ing form
can I not be elapsing? can you not be elapsing? can she not be elapsing? can we not be elapsing? can you not be elapsing? can they not be elapsing?
Perfect
can I not have elapsed? can you not have elapsed? can she not have elapsed? can we not have elapsed? can you not have elapsed? can they not have elapsed?
V-ing perfect
can I not have been elapsing? can you not have been elapsing? can she not have been elapsing? can we not have been elapsing? can you not have been elapsing? can they not have been elapsing?