it is up to sb to do sth
请问,It is up to sb.to do sth.
be up to do be up to doing be up to sb to do sth it is up to
it's up to sb.to do sth.
it is up to sb for sth 还是to do sh?
sb.is up to sth.
it is adj.of sb.to do sth.it is adj.from sb.to do sth.
It is possible for sb(sth) to do sth
是sth is important to sb还是 it is important for sb to do sth?
"It is+adj.+to+sb.+to do sth." 和 “It is + adj.+for +sb.+to d
be important to sb.与It is important for sb.to do sth.与 sth.i
sb.spends some time doing sth.it is+adj.+for sb.to do sth.it
it is time to和see sb do sth造句