I can japan you can japan he can japan we can japan you can japan they can japan
V-ing form
I can be japaning you can be japaning he can be japaning we can be japaning you can be japaning they can be japaning
Perfect
I can have japaned you can have japaned he can have japaned we can have japaned you can have japaned they can have japaned
V-ing perfect
I can have been japaning you can have been japaning he can have been japaning we can have been japaning you can have been japaning they can have been japaning
Negation
Simple form
I can't japan you can't japan he can't japan we can't japan you can't japan they can't japan
V-ing form
I can't be japaning you can't be japaning he can't be japaning we can't be japaning you can't be japaning they can't be japaning
Perfect
I can't have japaned you can't have japaned he can't have japaned we can't have japaned you can't have japaned they can't have japaned
V-ing perfect
I can't have been japaning you can't have been japaning he can't have been japaning we can't have been japaning you can't have been japaning they can't have been japaning
Interrogative form
Simple form
can I japan? can you japan? can he japan? can we japan? can you japan? can they japan?
V-ing form
can I be japaning? can you be japaning? can he be japaning? can we be japaning? can you be japaning? can they be japaning?
Perfect
can I have japaned? can you have japaned? can he have japaned? can we have japaned? can you have japaned? can they have japaned?
V-ing perfect
can I have been japaning? can you have been japaning? can he have been japaning? can we have been japaning? can you have been japaning? can they have been japaning?
Interro-negative form
Simple form
can't I japan? can't you japan? can't he japan? can't we japan? can't you japan? can't they japan?
V-ing form
can't I be japaning? can't you be japaning? can't he be japaning? can't we be japaning? can't you be japaning? can't they be japaning?
Perfect
can't I have japaned? can't you have japaned? can't he have japaned? can't we have japaned? can't you have japaned? can't they have japaned?
V-ing perfect
can't I have been japaning? can't you have been japaning? can't he have been japaning? can't we have been japaning? can't you have been japaning? can't they have been japaning?