I can concatenate you can concatenate he can concatenate we can concatenate you can concatenate they can concatenate
V-ing form
I can be concatenating you can be concatenating he can be concatenating we can be concatenating you can be concatenating they can be concatenating
Perfect
I can have concatenated you can have concatenated he can have concatenated we can have concatenated you can have concatenated they can have concatenated
V-ing perfect
I can have been concatenating you can have been concatenating he can have been concatenating we can have been concatenating you can have been concatenating they can have been concatenating
Negation
Simple form
I cannot concatenate you cannot concatenate he cannot concatenate we cannot concatenate you cannot concatenate they cannot concatenate
V-ing form
I cannot be concatenating you cannot be concatenating he cannot be concatenating we cannot be concatenating you cannot be concatenating they cannot be concatenating
Perfect
I cannot have concatenated you cannot have concatenated he cannot have concatenated we cannot have concatenated you cannot have concatenated they cannot have concatenated
V-ing perfect
I cannot have been concatenating you cannot have been concatenating he cannot have been concatenating we cannot have been concatenating you cannot have been concatenating they cannot have been concatenating
Interrogative form
Simple form
can I concatenate? can you concatenate? can he concatenate? can we concatenate? can you concatenate? can they concatenate?
V-ing form
can I be concatenating? can you be concatenating? can he be concatenating? can we be concatenating? can you be concatenating? can they be concatenating?
Perfect
can I have concatenated? can you have concatenated? can he have concatenated? can we have concatenated? can you have concatenated? can they have concatenated?
V-ing perfect
can I have been concatenating? can you have been concatenating? can he have been concatenating? can we have been concatenating? can you have been concatenating? can they have been concatenating?
Interro-negative form
Simple form
can I not concatenate? can you not concatenate? can he not concatenate? can we not concatenate? can you not concatenate? can they not concatenate?
V-ing form
can I not be concatenating? can you not be concatenating? can he not be concatenating? can we not be concatenating? can you not be concatenating? can they not be concatenating?
Perfect
can I not have concatenated? can you not have concatenated? can he not have concatenated? can we not have concatenated? can you not have concatenated? can they not have concatenated?
V-ing perfect
can I not have been concatenating? can you not have been concatenating? can he not have been concatenating? can we not have been concatenating? can you not have been concatenating? can they not have been concatenating?