I can backstitch you can backstitch he can backstitch we can backstitch you can backstitch they can backstitch
V-ing form
I can be backstitching you can be backstitching he can be backstitching we can be backstitching you can be backstitching they can be backstitching
Perfect
I can have backstitched you can have backstitched he can have backstitched we can have backstitched you can have backstitched they can have backstitched
V-ing perfect
I can have been backstitching you can have been backstitching he can have been backstitching we can have been backstitching you can have been backstitching they can have been backstitching
Negation
Simple form
I can't backstitch you can't backstitch he can't backstitch we can't backstitch you can't backstitch they can't backstitch
V-ing form
I can't be backstitching you can't be backstitching he can't be backstitching we can't be backstitching you can't be backstitching they can't be backstitching
Perfect
I can't have backstitched you can't have backstitched he can't have backstitched we can't have backstitched you can't have backstitched they can't have backstitched
V-ing perfect
I can't have been backstitching you can't have been backstitching he can't have been backstitching we can't have been backstitching you can't have been backstitching they can't have been backstitching
Interrogative form
Simple form
can I backstitch? can you backstitch? can he backstitch? can we backstitch? can you backstitch? can they backstitch?
V-ing form
can I be backstitching? can you be backstitching? can he be backstitching? can we be backstitching? can you be backstitching? can they be backstitching?
Perfect
can I have backstitched? can you have backstitched? can he have backstitched? can we have backstitched? can you have backstitched? can they have backstitched?
V-ing perfect
can I have been backstitching? can you have been backstitching? can he have been backstitching? can we have been backstitching? can you have been backstitching? can they have been backstitching?
Interro-negative form
Simple form
can't I backstitch? can't you backstitch? can't he backstitch? can't we backstitch? can't you backstitch? can't they backstitch?
V-ing form
can't I be backstitching? can't you be backstitching? can't he be backstitching? can't we be backstitching? can't you be backstitching? can't they be backstitching?
Perfect
can't I have backstitched? can't you have backstitched? can't he have backstitched? can't we have backstitched? can't you have backstitched? can't they have backstitched?
V-ing perfect
can't I have been backstitching? can't you have been backstitching? can't he have been backstitching? can't we have been backstitching? can't you have been backstitching? can't they have been backstitching?