English verb conjugation
CAN BACKCHECK

Regular verb: backcheck - backchecked - backchecked

Affirmation

Simple form	V-ing form
I can backcheck you can backcheck he can backcheck we can backcheck you can backcheck they can backcheck	I can be backchecking you can be backchecking he can be backchecking we can be backchecking you can be backchecking they can be backchecking
Perfect	V-ing perfect
I can have backchecked you can have backchecked he can have backchecked we can have backchecked you can have backchecked they can have backchecked	I can have been backchecking you can have been backchecking he can have been backchecking we can have been backchecking you can have been backchecking they can have been backchecking

Negation

Simple form	V-ing form
I can't backcheck you can't backcheck he can't backcheck we can't backcheck you can't backcheck they can't backcheck	I can't be backchecking you can't be backchecking he can't be backchecking we can't be backchecking you can't be backchecking they can't be backchecking
Perfect	V-ing perfect
I can't have backchecked you can't have backchecked he can't have backchecked we can't have backchecked you can't have backchecked they can't have backchecked	I can't have been backchecking you can't have been backchecking he can't have been backchecking we can't have been backchecking you can't have been backchecking they can't have been backchecking

Interrogative form

Simple form	V-ing form
can I backcheck? can you backcheck? can he backcheck? can we backcheck? can you backcheck? can they backcheck?	can I be backchecking? can you be backchecking? can he be backchecking? can we be backchecking? can you be backchecking? can they be backchecking?
Perfect	V-ing perfect
can I have backchecked? can you have backchecked? can he have backchecked? can we have backchecked? can you have backchecked? can they have backchecked?	can I have been backchecking? can you have been backchecking? can he have been backchecking? can we have been backchecking? can you have been backchecking? can they have been backchecking?

Interro-negative form

Simple form	V-ing form
can't I backcheck? can't you backcheck? can't he backcheck? can't we backcheck? can't you backcheck? can't they backcheck?	can't I be backchecking? can't you be backchecking? can't he be backchecking? can't we be backchecking? can't you be backchecking? can't they be backchecking?
Perfect	V-ing perfect
can't I have backchecked? can't you have backchecked? can't he have backchecked? can't we have backchecked? can't you have backchecked? can't they have backchecked?	can't I have been backchecking? can't you have been backchecking? can't he have been backchecking? can't we have been backchecking? can't you have been backchecking? can't they have been backchecking?