instruct 的核心含义是“传授知识或技能”,即系统地教授、指导。其本义源于拉丁语 instruere,意为“建造、装备”,引申为“为某人提供知识或信息,使其能完成某事”。由此派生出几个紧密相关的义项:1)教授、训练,强调系统性地传授知识和技能,如 instruct students in math;2)指示、命令,指上级对下级或权威方发出明确指令,如 instruct employees to follow safety rules;3)通知、告知,正式地提供信息,如 be instructed that the meeting is postponed。这些义项的共同点是“有方向性地传递信息或知识”,从“建造”的本义引申出“在头脑中构建知识体系”或“构建行动方向”的隐喻。
instruct 属于中性偏正式的动词,常用于学术写作、商务邮件、法律文本和官方文件中。在学术写作中,instruct 强调系统教学,如“The manual instructs users on how to operate the device.”;商务邮件中,instruct 常表示上级对下级的明确要求,语气直接,如“Please instruct your team to submit the report by Friday.”;新闻报道中,instruct 用于描述官方命令或指引,如“The government instructed citizens to evacuate the area.”;法律文本中,instruct 指法庭对陪审团的指示或律师对客户的指导,如“The judge instructed the jury to disregard the testimony.”。在日常口语中,instruct 较少使用,更常用 teach、tell 或 show,因为 instruct 带有正式和权威色彩。
语法要点
instruct 是及物动词,可接宾语,常见句型有:1)instruct + 宾语 + in/on + 某领域,表示“在……方面指导”,如 “She instructs students in English.”;2)instruct + 宾语 + to do,表示“指示某人做某事”,如 “He instructed his assistant to cancel the meeting.”;3)instruct + that 从句(用虚拟语气),表示“通知、指示”,如 “We were instructed that we should not enter the area.”;4)被动语态 be instructed + to do 很常见,如 “Staff were instructed to wear uniforms.”。易错点:instruct 后接 that 从句时,从句谓语常用“should + 动词原形”或直接用动词原形(虚拟语气),不可省略 that;另外,instruct 不用于进行时态表示“正在指导”的持续动作,但可用于被动语态。