I can approximate you can approximate he can approximate we can approximate you can approximate they can approximate
V-ing form
I can be approximating you can be approximating he can be approximating we can be approximating you can be approximating they can be approximating
Perfect
I can have approximated you can have approximated he can have approximated we can have approximated you can have approximated they can have approximated
V-ing perfect
I can have been approximating you can have been approximating he can have been approximating we can have been approximating you can have been approximating they can have been approximating
Negation
Simple form
I cannot approximate you cannot approximate he cannot approximate we cannot approximate you cannot approximate they cannot approximate
V-ing form
I cannot be approximating you cannot be approximating he cannot be approximating we cannot be approximating you cannot be approximating they cannot be approximating
Perfect
I cannot have approximated you cannot have approximated he cannot have approximated we cannot have approximated you cannot have approximated they cannot have approximated
V-ing perfect
I cannot have been approximating you cannot have been approximating he cannot have been approximating we cannot have been approximating you cannot have been approximating they cannot have been approximating
Interrogative form
Simple form
can I approximate? can you approximate? can he approximate? can we approximate? can you approximate? can they approximate?
V-ing form
can I be approximating? can you be approximating? can he be approximating? can we be approximating? can you be approximating? can they be approximating?
Perfect
can I have approximated? can you have approximated? can he have approximated? can we have approximated? can you have approximated? can they have approximated?
V-ing perfect
can I have been approximating? can you have been approximating? can he have been approximating? can we have been approximating? can you have been approximating? can they have been approximating?
Interro-negative form
Simple form
can I not approximate? can you not approximate? can he not approximate? can we not approximate? can you not approximate? can they not approximate?
V-ing form
can I not be approximating? can you not be approximating? can he not be approximating? can we not be approximating? can you not be approximating? can they not be approximating?
Perfect
can I not have approximated? can you not have approximated? can he not have approximated? can we not have approximated? can you not have approximated? can they not have approximated?
V-ing perfect
can I not have been approximating? can you not have been approximating? can he not have been approximating? can we not have been approximating? can you not have been approximating? can they not have been approximating?