I can try you can try he can try we can try you can try they can try
V-ing form
I can be trying you can be trying he can be trying we can be trying you can be trying they can be trying
Perfect
I can have tried you can have tried he can have tried we can have tried you can have tried they can have tried
V-ing perfect
I can have been trying you can have been trying he can have been trying we can have been trying you can have been trying they can have been trying
Negation
Simple form
I can't try you can't try he can't try we can't try you can't try they can't try
V-ing form
I can't be trying you can't be trying he can't be trying we can't be trying you can't be trying they can't be trying
Perfect
I can't have tried you can't have tried he can't have tried we can't have tried you can't have tried they can't have tried
V-ing perfect
I can't have been trying you can't have been trying he can't have been trying we can't have been trying you can't have been trying they can't have been trying
Interrogative form
Simple form
can I try? can you try? can he try? can we try? can you try? can they try?
V-ing form
can I be trying? can you be trying? can he be trying? can we be trying? can you be trying? can they be trying?
Perfect
can I have tried? can you have tried? can he have tried? can we have tried? can you have tried? can they have tried?
V-ing perfect
can I have been trying? can you have been trying? can he have been trying? can we have been trying? can you have been trying? can they have been trying?
Interro-negative form
Simple form
can't I try? can't you try? can't he try? can't we try? can't you try? can't they try?
V-ing form
can't I be trying? can't you be trying? can't he be trying? can't we be trying? can't you be trying? can't they be trying?
Perfect
can't I have tried? can't you have tried? can't he have tried? can't we have tried? can't you have tried? can't they have tried?
V-ing perfect
can't I have been trying? can't you have been trying? can't he have been trying? can't we have been trying? can't you have been trying? can't they have been trying?