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 can't replace you can't replace he can't replace we can't replace you can't replace they can't replace
V-ing form
I can't be replacing you can't be replacing he can't be replacing we can't be replacing you can't be replacing they can't be replacing
Perfect
I can't have replaced you can't have replaced he can't have replaced we can't have replaced you can't have replaced they can't have replaced
V-ing perfect
I can't have been replacing you can't have been replacing he can't have been replacing we can't have been replacing you can't have been replacing they can't 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't I replace? can't you replace? can't he replace? can't we replace? can't you replace? can't they replace?
V-ing form
can't I be replacing? can't you be replacing? can't he be replacing? can't we be replacing? can't you be replacing? can't they be replacing?
Perfect
can't I have replaced? can't you have replaced? can't he have replaced? can't we have replaced? can't you have replaced? can't they have replaced?
V-ing perfect
can't I have been replacing? can't you have been replacing? can't he have been replacing? can't we have been replacing? can't you have been replacing? can't they have been replacing?