Sth is done sth by sb
Sth is done sth by sb
by sth for sb
by sth ______ sb
by sth for sb.
It is first time that sb.have done sth.
sth run out of by sb 还是sth is run out of by sb
by sth.to sb.还是by sth.for sb.
sb learn sth by oneself
if sb had done sth/ sb have done造句
have sth./sb.done的用法,
observe sb.\sth.done的例句急!
let sb/sth do还是done