I can code you can code she can code we can code you can code they can code
V-ing form
I can be coding you can be coding she can be coding we can be coding you can be coding they can be coding
Perfect
I can have coded you can have coded she 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 she can have been coding we can have been coding you can have been coding they can have been coding
Negation
Simple form
I cannot code you cannot code she cannot code we cannot code you cannot code they cannot code
V-ing form
I cannot be coding you cannot be coding she cannot be coding we cannot be coding you cannot be coding they cannot be coding
Perfect
I cannot have coded you cannot have coded she cannot have coded we cannot have coded you cannot have coded they cannot have coded
V-ing perfect
I cannot have been coding you cannot have been coding she cannot have been coding we cannot have been coding you cannot have been coding they cannot have been coding
Interrogative form
Simple form
can I code? can you code? can she code? can we code? can you code? can they code?
V-ing form
can I be coding? can you be coding? can she be coding? can we be coding? can you be coding? can they be coding?
Perfect
can I have coded? can you have coded? can she 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 she have been coding? can we have been coding? can you have been coding? can they have been coding?
Interro-negative form
Simple form
can I not code? can you not code? can she not code? can we not code? can you not code? can they not code?
V-ing form
can I not be coding? can you not be coding? can she not be coding? can we not be coding? can you not be coding? can they not be coding?
Perfect
can I not have coded? can you not have coded? can she not have coded? can we not have coded? can you not have coded? can they not have coded?
V-ing perfect
can I not have been coding? can you not have been coding? can she not have been coding? can we not have been coding? can you not have been coding? can they not have been coding?