I can worry you can worry she can worry we can worry you can worry they can worry
V-ing form
I can be worrying you can be worrying she can be worrying we can be worrying you can be worrying they can be worrying
Perfect
I can have worried you can have worried she can have worried we can have worried you can have worried they can have worried
V-ing perfect
I can have been worrying you can have been worrying she can have been worrying we can have been worrying you can have been worrying they can have been worrying
Negation
Simple form
I can't worry you can't worry she can't worry we can't worry you can't worry they can't worry
V-ing form
I can't be worrying you can't be worrying she can't be worrying we can't be worrying you can't be worrying they can't be worrying
Perfect
I can't have worried you can't have worried she can't have worried we can't have worried you can't have worried they can't have worried
V-ing perfect
I can't have been worrying you can't have been worrying she can't have been worrying we can't have been worrying you can't have been worrying they can't have been worrying
Interrogative form
Simple form
can I worry? can you worry? can she worry? can we worry? can you worry? can they worry?
V-ing form
can I be worrying? can you be worrying? can she be worrying? can we be worrying? can you be worrying? can they be worrying?
Perfect
can I have worried? can you have worried? can she have worried? can we have worried? can you have worried? can they have worried?
V-ing perfect
can I have been worrying? can you have been worrying? can she have been worrying? can we have been worrying? can you have been worrying? can they have been worrying?
Interro-negative form
Simple form
can't I worry? can't you worry? can't she worry? can't we worry? can't you worry? can't they worry?
V-ing form
can't I be worrying? can't you be worrying? can't she be worrying? can't we be worrying? can't you be worrying? can't they be worrying?
Perfect
can't I have worried? can't you have worried? can't she have worried? can't we have worried? can't you have worried? can't they have worried?
V-ing perfect
can't I have been worrying? can't you have been worrying? can't she have been worrying? can't we have been worrying? can't you have been worrying? can't they have been worrying?