I can sandwich you can sandwich he can sandwich we can sandwich you can sandwich they can sandwich
V-ing form
I can be sandwiching you can be sandwiching he can be sandwiching we can be sandwiching you can be sandwiching they can be sandwiching
Perfect
I can have sandwiched you can have sandwiched he can have sandwiched we can have sandwiched you can have sandwiched they can have sandwiched
V-ing perfect
I can have been sandwiching you can have been sandwiching he can have been sandwiching we can have been sandwiching you can have been sandwiching they can have been sandwiching
Negation
Simple form
I can't sandwich you can't sandwich he can't sandwich we can't sandwich you can't sandwich they can't sandwich
V-ing form
I can't be sandwiching you can't be sandwiching he can't be sandwiching we can't be sandwiching you can't be sandwiching they can't be sandwiching
Perfect
I can't have sandwiched you can't have sandwiched he can't have sandwiched we can't have sandwiched you can't have sandwiched they can't have sandwiched
V-ing perfect
I can't have been sandwiching you can't have been sandwiching he can't have been sandwiching we can't have been sandwiching you can't have been sandwiching they can't have been sandwiching
Interrogative form
Simple form
can I sandwich? can you sandwich? can he sandwich? can we sandwich? can you sandwich? can they sandwich?
V-ing form
can I be sandwiching? can you be sandwiching? can he be sandwiching? can we be sandwiching? can you be sandwiching? can they be sandwiching?
Perfect
can I have sandwiched? can you have sandwiched? can he have sandwiched? can we have sandwiched? can you have sandwiched? can they have sandwiched?
V-ing perfect
can I have been sandwiching? can you have been sandwiching? can he have been sandwiching? can we have been sandwiching? can you have been sandwiching? can they have been sandwiching?
Interro-negative form
Simple form
can't I sandwich? can't you sandwich? can't he sandwich? can't we sandwich? can't you sandwich? can't they sandwich?
V-ing form
can't I be sandwiching? can't you be sandwiching? can't he be sandwiching? can't we be sandwiching? can't you be sandwiching? can't they be sandwiching?
Perfect
can't I have sandwiched? can't you have sandwiched? can't he have sandwiched? can't we have sandwiched? can't you have sandwiched? can't they have sandwiched?
V-ing perfect
can't I have been sandwiching? can't you have been sandwiching? can't he have been sandwiching? can't we have been sandwiching? can't you have been sandwiching? can't they have been sandwiching?