②表示客观真理和普遍事实。(常见于名言警句) e.g. Actions speak louder than words. e.g. We have friends all over the world. ③表示按照计划、规定、时间表将要发生的动作 come/go/begin/start/leave/arrive/ open/close/stop/return… e.g. The plane takes off at nine tomorrow morning. e.g. We leave here at 8:00 sharp.