I can loosen you can loosen he can loosen we can loosen you can loosen they can loosen
V-ing form
I can be loosening you can be loosening he can be loosening we can be loosening you can be loosening they can be loosening
Perfect
I can have loosened you can have loosened he can have loosened we can have loosened you can have loosened they can have loosened
V-ing perfect
I can have been loosening you can have been loosening he can have been loosening we can have been loosening you can have been loosening they can have been loosening
Negation
Simple form
I can't loosen you can't loosen he can't loosen we can't loosen you can't loosen they can't loosen
V-ing form
I can't be loosening you can't be loosening he can't be loosening we can't be loosening you can't be loosening they can't be loosening
Perfect
I can't have loosened you can't have loosened he can't have loosened we can't have loosened you can't have loosened they can't have loosened
V-ing perfect
I can't have been loosening you can't have been loosening he can't have been loosening we can't have been loosening you can't have been loosening they can't have been loosening
Interrogative form
Simple form
can I loosen? can you loosen? can he loosen? can we loosen? can you loosen? can they loosen?
V-ing form
can I be loosening? can you be loosening? can he be loosening? can we be loosening? can you be loosening? can they be loosening?
Perfect
can I have loosened? can you have loosened? can he have loosened? can we have loosened? can you have loosened? can they have loosened?
V-ing perfect
can I have been loosening? can you have been loosening? can he have been loosening? can we have been loosening? can you have been loosening? can they have been loosening?
Interro-negative form
Simple form
can't I loosen? can't you loosen? can't he loosen? can't we loosen? can't you loosen? can't they loosen?
V-ing form
can't I be loosening? can't you be loosening? can't he be loosening? can't we be loosening? can't you be loosening? can't they be loosening?
Perfect
can't I have loosened? can't you have loosened? can't he have loosened? can't we have loosened? can't you have loosened? can't they have loosened?
V-ing perfect
can't I have been loosening? can't you have been loosening? can't he have been loosening? can't we have been loosening? can't you have been loosening? can't they have been loosening?