I can blackberry you can blackberry she can blackberry we can blackberry you can blackberry they can blackberry
V-ing form
I can be blackberrying you can be blackberrying she can be blackberrying we can be blackberrying you can be blackberrying they can be blackberrying
Perfect
I can have blackberried you can have blackberried she can have blackberried we can have blackberried you can have blackberried they can have blackberried
V-ing perfect
I can have been blackberrying you can have been blackberrying she can have been blackberrying we can have been blackberrying you can have been blackberrying they can have been blackberrying
Negation
Simple form
I cannot blackberry you cannot blackberry she cannot blackberry we cannot blackberry you cannot blackberry they cannot blackberry
V-ing form
I cannot be blackberrying you cannot be blackberrying she cannot be blackberrying we cannot be blackberrying you cannot be blackberrying they cannot be blackberrying
Perfect
I cannot have blackberried you cannot have blackberried she cannot have blackberried we cannot have blackberried you cannot have blackberried they cannot have blackberried
V-ing perfect
I cannot have been blackberrying you cannot have been blackberrying she cannot have been blackberrying we cannot have been blackberrying you cannot have been blackberrying they cannot have been blackberrying
Interrogative form
Simple form
can I blackberry? can you blackberry? can she blackberry? can we blackberry? can you blackberry? can they blackberry?
V-ing form
can I be blackberrying? can you be blackberrying? can she be blackberrying? can we be blackberrying? can you be blackberrying? can they be blackberrying?
Perfect
can I have blackberried? can you have blackberried? can she have blackberried? can we have blackberried? can you have blackberried? can they have blackberried?
V-ing perfect
can I have been blackberrying? can you have been blackberrying? can she have been blackberrying? can we have been blackberrying? can you have been blackberrying? can they have been blackberrying?
Interro-negative form
Simple form
can I not blackberry? can you not blackberry? can she not blackberry? can we not blackberry? can you not blackberry? can they not blackberry?
V-ing form
can I not be blackberrying? can you not be blackberrying? can she not be blackberrying? can we not be blackberrying? can you not be blackberrying? can they not be blackberrying?
Perfect
can I not have blackberried? can you not have blackberried? can she not have blackberried? can we not have blackberried? can you not have blackberried? can they not have blackberried?
V-ing perfect
can I not have been blackberrying? can you not have been blackberrying? can she not have been blackberrying? can we not have been blackberrying? can you not have been blackberrying? can they not have been blackberrying?