反对做某事是be againest doing sth ,反对某事物是be against something
支持做某事可以用 be for doing sth ,且常与be againest doing sth 互为反义,同样,也可以是be for be something.支持也可以用stand for.
(主张;支持,拥护,例：We stand for self-reliance.我们主张自力更生.）
We are against the war and for the peace.
We are against the war and stand forthe peace.