I can sandwich you can sandwich she can sandwich we can sandwich you can sandwich they can sandwich
V-ing form
I can be sandwiching you can be sandwiching she can be sandwiching we can be sandwiching you can be sandwiching they can be sandwiching
Perfect
I can have sandwiched you can have sandwiched she 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 she can have been sandwiching we can have been sandwiching you can have been sandwiching they can have been sandwiching
Negation
Simple form
I cannot sandwich you cannot sandwich she cannot sandwich we cannot sandwich you cannot sandwich they cannot sandwich
V-ing form
I cannot be sandwiching you cannot be sandwiching she cannot be sandwiching we cannot be sandwiching you cannot be sandwiching they cannot be sandwiching
Perfect
I cannot have sandwiched you cannot have sandwiched she cannot have sandwiched we cannot have sandwiched you cannot have sandwiched they cannot have sandwiched
V-ing perfect
I cannot have been sandwiching you cannot have been sandwiching she cannot have been sandwiching we cannot have been sandwiching you cannot have been sandwiching they cannot have been sandwiching
Interrogative form
Simple form
can I sandwich? can you sandwich? can she sandwich? can we sandwich? can you sandwich? can they sandwich?
V-ing form
can I be sandwiching? can you be sandwiching? can she be sandwiching? can we be sandwiching? can you be sandwiching? can they be sandwiching?
Perfect
can I have sandwiched? can you have sandwiched? can she 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 she have been sandwiching? can we have been sandwiching? can you have been sandwiching? can they have been sandwiching?
Interro-negative form
Simple form
can I not sandwich? can you not sandwich? can she not sandwich? can we not sandwich? can you not sandwich? can they not sandwich?
V-ing form
can I not be sandwiching? can you not be sandwiching? can she not be sandwiching? can we not be sandwiching? can you not be sandwiching? can they not be sandwiching?
Perfect
can I not have sandwiched? can you not have sandwiched? can she not have sandwiched? can we not have sandwiched? can you not have sandwiched? can they not have sandwiched?
V-ing perfect
can I not have been sandwiching? can you not have been sandwiching? can she not have been sandwiching? can we not have been sandwiching? can you not have been sandwiching? can they not have been sandwiching?