I can code you can code he can code we can code you can code they can code
V-ing form
I can be coding you can be coding he can be coding we can be coding you can be coding they can be coding
Perfect
I can have coded you can have coded he can have coded we can have coded you can have coded they can have coded
V-ing perfect
I can have been coding you can have been coding he can have been coding we can have been coding you can have been coding they can have been coding
Negation
Simple form
I can't code you can't code he can't code we can't code you can't code they can't code
V-ing form
I can't be coding you can't be coding he can't be coding we can't be coding you can't be coding they can't be coding
Perfect
I can't have coded you can't have coded he can't have coded we can't have coded you can't have coded they can't have coded
V-ing perfect
I can't have been coding you can't have been coding he can't have been coding we can't have been coding you can't have been coding they can't have been coding
Interrogative form
Simple form
can I code? can you code? can he code? can we code? can you code? can they code?
V-ing form
can I be coding? can you be coding? can he be coding? can we be coding? can you be coding? can they be coding?
Perfect
can I have coded? can you have coded? can he have coded? can we have coded? can you have coded? can they have coded?
V-ing perfect
can I have been coding? can you have been coding? can he have been coding? can we have been coding? can you have been coding? can they have been coding?
Interro-negative form
Simple form
can't I code? can't you code? can't he code? can't we code? can't you code? can't they code?
V-ing form
can't I be coding? can't you be coding? can't he be coding? can't we be coding? can't you be coding? can't they be coding?
Perfect
can't I have coded? can't you have coded? can't he have coded? can't we have coded? can't you have coded? can't they have coded?
V-ing perfect
can't I have been coding? can't you have been coding? can't he have been coding? can't we have been coding? can't you have been coding? can't they have been coding?