I can overacheive you can overacheive he can overacheive we can overacheive you can overacheive they can overacheive
V-ing form
I can be overacheiving you can be overacheiving he can be overacheiving we can be overacheiving you can be overacheiving they can be overacheiving
Perfect
I can have overacheived you can have overacheived he can have overacheived we can have overacheived you can have overacheived they can have overacheived
V-ing perfect
I can have been overacheiving you can have been overacheiving he can have been overacheiving we can have been overacheiving you can have been overacheiving they can have been overacheiving
Negation
Simple form
I cannot overacheive you cannot overacheive he cannot overacheive we cannot overacheive you cannot overacheive they cannot overacheive
V-ing form
I cannot be overacheiving you cannot be overacheiving he cannot be overacheiving we cannot be overacheiving you cannot be overacheiving they cannot be overacheiving
Perfect
I cannot have overacheived you cannot have overacheived he cannot have overacheived we cannot have overacheived you cannot have overacheived they cannot have overacheived
V-ing perfect
I cannot have been overacheiving you cannot have been overacheiving he cannot have been overacheiving we cannot have been overacheiving you cannot have been overacheiving they cannot have been overacheiving
Interrogative form
Simple form
can I overacheive? can you overacheive? can he overacheive? can we overacheive? can you overacheive? can they overacheive?
V-ing form
can I be overacheiving? can you be overacheiving? can he be overacheiving? can we be overacheiving? can you be overacheiving? can they be overacheiving?
Perfect
can I have overacheived? can you have overacheived? can he have overacheived? can we have overacheived? can you have overacheived? can they have overacheived?
V-ing perfect
can I have been overacheiving? can you have been overacheiving? can he have been overacheiving? can we have been overacheiving? can you have been overacheiving? can they have been overacheiving?
Interro-negative form
Simple form
can I not overacheive? can you not overacheive? can he not overacheive? can we not overacheive? can you not overacheive? can they not overacheive?
V-ing form
can I not be overacheiving? can you not be overacheiving? can he not be overacheiving? can we not be overacheiving? can you not be overacheiving? can they not be overacheiving?
Perfect
can I not have overacheived? can you not have overacheived? can he not have overacheived? can we not have overacheived? can you not have overacheived? can they not have overacheived?
V-ing perfect
can I not have been overacheiving? can you not have been overacheiving? can he not have been overacheiving? can we not have been overacheiving? can you not have been overacheiving? can they not have been overacheiving?