I can concatenate you can concatenate she can concatenate we can concatenate you can concatenate they can concatenate
V-ing form
I can be concatenating you can be concatenating she can be concatenating we can be concatenating you can be concatenating they can be concatenating
Perfect
I can have concatenated you can have concatenated she 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 she 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 she cannot concatenate we cannot concatenate you cannot concatenate they cannot concatenate
V-ing form
I cannot be concatenating you cannot be concatenating she cannot be concatenating we cannot be concatenating you cannot be concatenating they cannot be concatenating
Perfect
I cannot have concatenated you cannot have concatenated she 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 she 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 she concatenate? can we concatenate? can you concatenate? can they concatenate?
V-ing form
can I be concatenating? can you be concatenating? can she be concatenating? can we be concatenating? can you be concatenating? can they be concatenating?
Perfect
can I have concatenated? can you have concatenated? can she 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 she 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 she 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 she 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 she 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 she not have been concatenating? can we not have been concatenating? can you not have been concatenating? can they not have been concatenating?