English verb conjugation
CAN MAIL

Regular verb: mail - mailed - mailed

Affirmation

Simple form	V-ing form
I can mail you can mail he can mail we can mail you can mail they can mail	I can be mailing you can be mailing he can be mailing we can be mailing you can be mailing they can be mailing
Perfect	V-ing perfect
I can have mailed you can have mailed he can have mailed we can have mailed you can have mailed they can have mailed	I can have been mailing you can have been mailing he can have been mailing we can have been mailing you can have been mailing they can have been mailing

Negation

Simple form	V-ing form
I can't mail you can't mail he can't mail we can't mail you can't mail they can't mail	I can't be mailing you can't be mailing he can't be mailing we can't be mailing you can't be mailing they can't be mailing
Perfect	V-ing perfect
I can't have mailed you can't have mailed he can't have mailed we can't have mailed you can't have mailed they can't have mailed	I can't have been mailing you can't have been mailing he can't have been mailing we can't have been mailing you can't have been mailing they can't have been mailing

Interrogative form

Simple form	V-ing form
can I mail? can you mail? can he mail? can we mail? can you mail? can they mail?	can I be mailing? can you be mailing? can he be mailing? can we be mailing? can you be mailing? can they be mailing?
Perfect	V-ing perfect
can I have mailed? can you have mailed? can he have mailed? can we have mailed? can you have mailed? can they have mailed?	can I have been mailing? can you have been mailing? can he have been mailing? can we have been mailing? can you have been mailing? can they have been mailing?

Interro-negative form

Simple form	V-ing form
can't I mail? can't you mail? can't he mail? can't we mail? can't you mail? can't they mail?	can't I be mailing? can't you be mailing? can't he be mailing? can't we be mailing? can't you be mailing? can't they be mailing?
Perfect	V-ing perfect
can't I have mailed? can't you have mailed? can't he have mailed? can't we have mailed? can't you have mailed? can't they have mailed?	can't I have been mailing? can't you have been mailing? can't he have been mailing? can't we have been mailing? can't you have been mailing? can't they have been mailing?