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 can't send you can't send he can't send we can't send you can't send they can't send
V-ing form
I can't be sending you can't be sending he can't be sending we can't be sending you can't be sending they can't be sending
Perfect
I can't have sent you can't have sent he can't have sent we can't have sent you can't have sent they can't have sent
V-ing perfect
I can't have been sending you can't have been sending he can't have been sending we can't have been sending you can't have been sending they can't 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't I send? can't you send? can't he send? can't we send? can't you send? can't they send?
V-ing form
can't I be sending? can't you be sending? can't he be sending? can't we be sending? can't you be sending? can't they be sending?
Perfect
can't I have sent? can't you have sent? can't he have sent? can't we have sent? can't you have sent? can't they have sent?
V-ing perfect
can't I have been sending? can't you have been sending? can't he have been sending? can't we have been sending? can't you have been sending? can't they have been sending?