by sth for sb

by sth for sb by sth for sb. by sth.to sb.还是by sth.for sb. be praise by sb for sth by sth ______ sb by sb sth 和 buy sth for sb 意思一样吗?用法一样吗? offerde sb sth for sth? be sth for sb ~sb for sth praise sb for sth buy sth.for sb. have sth for sb