I can praise you can praise he can praise we can praise you can praise they can praise
V-ing form
I can be praising you can be praising he can be praising we can be praising you can be praising they can be praising
Perfect
I can have praised you can have praised he can have praised we can have praised you can have praised they can have praised
V-ing perfect
I can have been praising you can have been praising he can have been praising we can have been praising you can have been praising they can have been praising
Negation
Simple form
I cannot praise you cannot praise he cannot praise we cannot praise you cannot praise they cannot praise
V-ing form
I cannot be praising you cannot be praising he cannot be praising we cannot be praising you cannot be praising they cannot be praising
Perfect
I cannot have praised you cannot have praised he cannot have praised we cannot have praised you cannot have praised they cannot have praised
V-ing perfect
I cannot have been praising you cannot have been praising he cannot have been praising we cannot have been praising you cannot have been praising they cannot have been praising
Interrogative form
Simple form
can I praise? can you praise? can he praise? can we praise? can you praise? can they praise?
V-ing form
can I be praising? can you be praising? can he be praising? can we be praising? can you be praising? can they be praising?
Perfect
can I have praised? can you have praised? can he have praised? can we have praised? can you have praised? can they have praised?
V-ing perfect
can I have been praising? can you have been praising? can he have been praising? can we have been praising? can you have been praising? can they have been praising?
Interro-negative form
Simple form
can I not praise? can you not praise? can he not praise? can we not praise? can you not praise? can they not praise?
V-ing form
can I not be praising? can you not be praising? can he not be praising? can we not be praising? can you not be praising? can they not be praising?
Perfect
can I not have praised? can you not have praised? can he not have praised? can we not have praised? can you not have praised? can they not have praised?
V-ing perfect
can I not have been praising? can you not have been praising? can he not have been praising? can we not have been praising? can you not have been praising? can they not have been praising?