I can size you can size he can size we can size you can size they can size
V-ing form
I can be sizing you can be sizing he can be sizing we can be sizing you can be sizing they can be sizing
Perfect
I can have sized you can have sized he can have sized we can have sized you can have sized they can have sized
V-ing perfect
I can have been sizing you can have been sizing he can have been sizing we can have been sizing you can have been sizing they can have been sizing
Negation
Simple form
I cannot size you cannot size he cannot size we cannot size you cannot size they cannot size
V-ing form
I cannot be sizing you cannot be sizing he cannot be sizing we cannot be sizing you cannot be sizing they cannot be sizing
Perfect
I cannot have sized you cannot have sized he cannot have sized we cannot have sized you cannot have sized they cannot have sized
V-ing perfect
I cannot have been sizing you cannot have been sizing he cannot have been sizing we cannot have been sizing you cannot have been sizing they cannot have been sizing
Interrogative form
Simple form
can I size? can you size? can he size? can we size? can you size? can they size?
V-ing form
can I be sizing? can you be sizing? can he be sizing? can we be sizing? can you be sizing? can they be sizing?
Perfect
can I have sized? can you have sized? can he have sized? can we have sized? can you have sized? can they have sized?
V-ing perfect
can I have been sizing? can you have been sizing? can he have been sizing? can we have been sizing? can you have been sizing? can they have been sizing?
Interro-negative form
Simple form
can I not size? can you not size? can he not size? can we not size? can you not size? can they not size?
V-ing form
can I not be sizing? can you not be sizing? can he not be sizing? can we not be sizing? can you not be sizing? can they not be sizing?
Perfect
can I not have sized? can you not have sized? can he not have sized? can we not have sized? can you not have sized? can they not have sized?
V-ing perfect
can I not have been sizing? can you not have been sizing? can he not have been sizing? can we not have been sizing? can you not have been sizing? can they not have been sizing?