生小病是get sick，生大病是fall或take sick.【be out sick】特指请病假或因病旷工. 例如，two of my colleagues were out sick today 今天我有两个同事请病假. 【call in sick】指打电话请病假。例如，Amy called in sick at the first day第一天上班Amy就打电话来说要请病假