I can send you can send he can send we can send you can send they can send
V-ing form
I can be sending you can be sending he can be sending we can be sending you can be sending they can be sending
Perfect
I can have sent you can have sent he can have sent we can have sent you can have sent they can have sent
V-ing perfect
I can have been sending you can have been sending he can have been sending we can have been sending you can have been sending they can have been sending
Negation
Simple form
I cannot send you cannot send he cannot send we cannot send you cannot send they cannot send
V-ing form
I cannot be sending you cannot be sending he cannot be sending we cannot be sending you cannot be sending they cannot be sending
Perfect
I cannot have sent you cannot have sent he cannot have sent we cannot have sent you cannot have sent they cannot have sent
V-ing perfect
I cannot have been sending you cannot have been sending he cannot have been sending we cannot have been sending you cannot have been sending they cannot have been sending
Interrogative form
Simple form
can I send? can you send? can he send? can we send? can you send? can they send?
V-ing form
can I be sending? can you be sending? can he be sending? can we be sending? can you be sending? can they be sending?
Perfect
can I have sent? can you have sent? can he have sent? can we have sent? can you have sent? can they have sent?
V-ing perfect
can I have been sending? can you have been sending? can he have been sending? can we have been sending? can you have been sending? can they have been sending?
Interro-negative form
Simple form
can I not send? can you not send? can he not send? can we not send? can you not send? can they not send?
V-ing form
can I not be sending? can you not be sending? can he not be sending? can we not be sending? can you not be sending? can they not be sending?
Perfect
can I not have sent? can you not have sent? can he not have sent? can we not have sent? can you not have sent? can they not have sent?
V-ing perfect
can I not have been sending? can you not have been sending? can he not have been sending? can we not have been sending? can you not have been sending? can they not have been sending?