I can choir you can choir he can choir we can choir you can choir they can choir
V-ing form
I can be choiring you can be choiring he can be choiring we can be choiring you can be choiring they can be choiring
Perfect
I can have choired you can have choired he can have choired we can have choired you can have choired they can have choired
V-ing perfect
I can have been choiring you can have been choiring he can have been choiring we can have been choiring you can have been choiring they can have been choiring
Negation
Simple form
I can't choir you can't choir he can't choir we can't choir you can't choir they can't choir
V-ing form
I can't be choiring you can't be choiring he can't be choiring we can't be choiring you can't be choiring they can't be choiring
Perfect
I can't have choired you can't have choired he can't have choired we can't have choired you can't have choired they can't have choired
V-ing perfect
I can't have been choiring you can't have been choiring he can't have been choiring we can't have been choiring you can't have been choiring they can't have been choiring
Interrogative form
Simple form
can I choir? can you choir? can he choir? can we choir? can you choir? can they choir?
V-ing form
can I be choiring? can you be choiring? can he be choiring? can we be choiring? can you be choiring? can they be choiring?
Perfect
can I have choired? can you have choired? can he have choired? can we have choired? can you have choired? can they have choired?
V-ing perfect
can I have been choiring? can you have been choiring? can he have been choiring? can we have been choiring? can you have been choiring? can they have been choiring?
Interro-negative form
Simple form
can't I choir? can't you choir? can't he choir? can't we choir? can't you choir? can't they choir?
V-ing form
can't I be choiring? can't you be choiring? can't he be choiring? can't we be choiring? can't you be choiring? can't they be choiring?
Perfect
can't I have choired? can't you have choired? can't he have choired? can't we have choired? can't you have choired? can't they have choired?
V-ing perfect
can't I have been choiring? can't you have been choiring? can't he have been choiring? can't we have been choiring? can't you have been choiring? can't they have been choiring?