I can blunder you can blunder he can blunder we can blunder you can blunder they can blunder
V-ing form
I can be blundering you can be blundering he can be blundering we can be blundering you can be blundering they can be blundering
Perfect
I can have blundered you can have blundered he can have blundered we can have blundered you can have blundered they can have blundered
V-ing perfect
I can have been blundering you can have been blundering he can have been blundering we can have been blundering you can have been blundering they can have been blundering
Negation
Simple form
I cannot blunder you cannot blunder he cannot blunder we cannot blunder you cannot blunder they cannot blunder
V-ing form
I cannot be blundering you cannot be blundering he cannot be blundering we cannot be blundering you cannot be blundering they cannot be blundering
Perfect
I cannot have blundered you cannot have blundered he cannot have blundered we cannot have blundered you cannot have blundered they cannot have blundered
V-ing perfect
I cannot have been blundering you cannot have been blundering he cannot have been blundering we cannot have been blundering you cannot have been blundering they cannot have been blundering
Interrogative form
Simple form
can I blunder? can you blunder? can he blunder? can we blunder? can you blunder? can they blunder?
V-ing form
can I be blundering? can you be blundering? can he be blundering? can we be blundering? can you be blundering? can they be blundering?
Perfect
can I have blundered? can you have blundered? can he have blundered? can we have blundered? can you have blundered? can they have blundered?
V-ing perfect
can I have been blundering? can you have been blundering? can he have been blundering? can we have been blundering? can you have been blundering? can they have been blundering?
Interro-negative form
Simple form
can I not blunder? can you not blunder? can he not blunder? can we not blunder? can you not blunder? can they not blunder?
V-ing form
can I not be blundering? can you not be blundering? can he not be blundering? can we not be blundering? can you not be blundering? can they not be blundering?
Perfect
can I not have blundered? can you not have blundered? can he not have blundered? can we not have blundered? can you not have blundered? can they not have blundered?
V-ing perfect
can I not have been blundering? can you not have been blundering? can he not have been blundering? can we not have been blundering? can you not have been blundering? can they not have been blundering?