I can replace you can replace he can replace we can replace you can replace they can replace
V-ing form
I can be replacing you can be replacing he can be replacing we can be replacing you can be replacing they can be replacing
Perfect
I can have replaced you can have replaced he can have replaced we can have replaced you can have replaced they can have replaced
V-ing perfect
I can have been replacing you can have been replacing he can have been replacing we can have been replacing you can have been replacing they can have been replacing
Negation
Simple form
I cannot replace you cannot replace he cannot replace we cannot replace you cannot replace they cannot replace
V-ing form
I cannot be replacing you cannot be replacing he cannot be replacing we cannot be replacing you cannot be replacing they cannot be replacing
Perfect
I cannot have replaced you cannot have replaced he cannot have replaced we cannot have replaced you cannot have replaced they cannot have replaced
V-ing perfect
I cannot have been replacing you cannot have been replacing he cannot have been replacing we cannot have been replacing you cannot have been replacing they cannot have been replacing
Interrogative form
Simple form
can I replace? can you replace? can he replace? can we replace? can you replace? can they replace?
V-ing form
can I be replacing? can you be replacing? can he be replacing? can we be replacing? can you be replacing? can they be replacing?
Perfect
can I have replaced? can you have replaced? can he have replaced? can we have replaced? can you have replaced? can they have replaced?
V-ing perfect
can I have been replacing? can you have been replacing? can he have been replacing? can we have been replacing? can you have been replacing? can they have been replacing?
Interro-negative form
Simple form
can I not replace? can you not replace? can he not replace? can we not replace? can you not replace? can they not replace?
V-ing form
can I not be replacing? can you not be replacing? can he not be replacing? can we not be replacing? can you not be replacing? can they not be replacing?
Perfect
can I not have replaced? can you not have replaced? can he not have replaced? can we not have replaced? can you not have replaced? can they not have replaced?
V-ing perfect
can I not have been replacing? can you not have been replacing? can he not have been replacing? can we not have been replacing? can you not have been replacing? can they not have been replacing?