I can well you can well she can well we can well you can well they can well
V-ing form
I can be welling you can be welling she can be welling we can be welling you can be welling they can be welling
Perfect
I can have welled you can have welled she can have welled we can have welled you can have welled they can have welled
V-ing perfect
I can have been welling you can have been welling she can have been welling we can have been welling you can have been welling they can have been welling
Negation
Simple form
I can't well you can't well she can't well we can't well you can't well they can't well
V-ing form
I can't be welling you can't be welling she can't be welling we can't be welling you can't be welling they can't be welling
Perfect
I can't have welled you can't have welled she can't have welled we can't have welled you can't have welled they can't have welled
V-ing perfect
I can't have been welling you can't have been welling she can't have been welling we can't have been welling you can't have been welling they can't have been welling
Interrogative form
Simple form
can I well? can you well? can she well? can we well? can you well? can they well?
V-ing form
can I be welling? can you be welling? can she be welling? can we be welling? can you be welling? can they be welling?
Perfect
can I have welled? can you have welled? can she have welled? can we have welled? can you have welled? can they have welled?
V-ing perfect
can I have been welling? can you have been welling? can she have been welling? can we have been welling? can you have been welling? can they have been welling?
Interro-negative form
Simple form
can't I well? can't you well? can't she well? can't we well? can't you well? can't they well?
V-ing form
can't I be welling? can't you be welling? can't she be welling? can't we be welling? can't you be welling? can't they be welling?
Perfect
can't I have welled? can't you have welled? can't she have welled? can't we have welled? can't you have welled? can't they have welled?
V-ing perfect
can't I have been welling? can't you have been welling? can't she have been welling? can't we have been welling? can't you have been welling? can't they have been welling?