是be up to sb to do还是doing?

是be up to sb to do还是doing? be up to do be up to doing be up to sb to do sth it is up to be difificult for sb do 还是doing还是to do be up to do 还是 be up doing 哪个对 是attract sb to do还是attract sb to doing? call up sb doing sth还是to do sth? 请问是believe sb.doing 还是believe sb to do? 是suggest sb to do 还是 suggest sb doing? recommend sb 后面是 to do 还是 to doing? limit sb to do 还是to doing chanllenge sb to do 还是to doing? for sb是doing 还是to do.thank for是doing还是to do