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 can't praise you can't praise he can't praise we can't praise you can't praise they can't praise
V-ing form
I can't be praising you can't be praising he can't be praising we can't be praising you can't be praising they can't be praising
Perfect
I can't have praised you can't have praised he can't have praised we can't have praised you can't have praised they can't have praised
V-ing perfect
I can't have been praising you can't have been praising he can't have been praising we can't have been praising you can't have been praising they can't 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't I praise? can't you praise? can't he praise? can't we praise? can't you praise? can't they praise?
V-ing form
can't I be praising? can't you be praising? can't he be praising? can't we be praising? can't you be praising? can't they be praising?
Perfect
can't I have praised? can't you have praised? can't he have praised? can't we have praised? can't you have praised? can't they have praised?
V-ing perfect
can't I have been praising? can't you have been praising? can't he have been praising? can't we have been praising? can't you have been praising? can't they have been praising?