I can winter you can winter he can winter we can winter you can winter they can winter
V-ing form
I can be wintering you can be wintering he can be wintering we can be wintering you can be wintering they can be wintering
Perfect
I can have wintered you can have wintered he can have wintered we can have wintered you can have wintered they can have wintered
V-ing perfect
I can have been wintering you can have been wintering he can have been wintering we can have been wintering you can have been wintering they can have been wintering
Negation
Simple form
I can't winter you can't winter he can't winter we can't winter you can't winter they can't winter
V-ing form
I can't be wintering you can't be wintering he can't be wintering we can't be wintering you can't be wintering they can't be wintering
Perfect
I can't have wintered you can't have wintered he can't have wintered we can't have wintered you can't have wintered they can't have wintered
V-ing perfect
I can't have been wintering you can't have been wintering he can't have been wintering we can't have been wintering you can't have been wintering they can't have been wintering
Interrogative form
Simple form
can I winter? can you winter? can he winter? can we winter? can you winter? can they winter?
V-ing form
can I be wintering? can you be wintering? can he be wintering? can we be wintering? can you be wintering? can they be wintering?
Perfect
can I have wintered? can you have wintered? can he have wintered? can we have wintered? can you have wintered? can they have wintered?
V-ing perfect
can I have been wintering? can you have been wintering? can he have been wintering? can we have been wintering? can you have been wintering? can they have been wintering?
Interro-negative form
Simple form
can't I winter? can't you winter? can't he winter? can't we winter? can't you winter? can't they winter?
V-ing form
can't I be wintering? can't you be wintering? can't he be wintering? can't we be wintering? can't you be wintering? can't they be wintering?
Perfect
can't I have wintered? can't you have wintered? can't he have wintered? can't we have wintered? can't you have wintered? can't they have wintered?
V-ing perfect
can't I have been wintering? can't you have been wintering? can't he have been wintering? can't we have been wintering? can't you have been wintering? can't they have been wintering?