关于sure 等同根词的演化

lingoes 灵格斯字典 lingo dialect   lingua 舌头 舌状物  language

secrete  secretary 心腹大患　　自古心腹必大患

point appoint disappoint  

　　Jefferson certainly was rather disappointing though.

sure 确定 are you sure?

insure 投保 保证

insurance 保险