I can program you can program he can program we can program you can program they can program
V-ing form
I can be programming you can be programming he can be programming we can be programming you can be programming they can be programming
Perfect
I can have programmed you can have programmed he can have programmed we can have programmed you can have programmed they can have programmed
V-ing perfect
I can have been programming you can have been programming he can have been programming we can have been programming you can have been programming they can have been programming
Negation
Simple form
I can't program you can't program he can't program we can't program you can't program they can't program
V-ing form
I can't be programming you can't be programming he can't be programming we can't be programming you can't be programming they can't be programming
Perfect
I can't have programmed you can't have programmed he can't have programmed we can't have programmed you can't have programmed they can't have programmed
V-ing perfect
I can't have been programming you can't have been programming he can't have been programming we can't have been programming you can't have been programming they can't have been programming
Interrogative form
Simple form
can I program? can you program? can he program? can we program? can you program? can they program?
V-ing form
can I be programming? can you be programming? can he be programming? can we be programming? can you be programming? can they be programming?
Perfect
can I have programmed? can you have programmed? can he have programmed? can we have programmed? can you have programmed? can they have programmed?
V-ing perfect
can I have been programming? can you have been programming? can he have been programming? can we have been programming? can you have been programming? can they have been programming?
Interro-negative form
Simple form
can't I program? can't you program? can't he program? can't we program? can't you program? can't they program?
V-ing form
can't I be programming? can't you be programming? can't he be programming? can't we be programming? can't you be programming? can't they be programming?
Perfect
can't I have programmed? can't you have programmed? can't he have programmed? can't we have programmed? can't you have programmed? can't they have programmed?
V-ing perfect
can't I have been programming? can't you have been programming? can't he have been programming? can't we have been programming? can't you have been programming? can't they have been programming?