(1)在……上面(covering， touching， fixed to the outer or upper side of)：climb～a horse 跨上马背;leave the glasses～the table 把眼镜放在桌上;sit～the grass/the chair/the floor/the side of the bed 坐在草地上/椅子上/地板上/床边;float～the water 漂浮在水面上;travel～the Continent在欧洲大陆旅行;a picture～the wall/the blackboard 挂在墙/黑板上的画;a coat～a hook衣钩上挂着的上衣; a flag～a pole旗杆上的旗子;a ring～the finger手指上的戒指;(work) fall～one's shoulders(工作)落在某人肩上;eyes downcast～knitting 视线落在编织物上;lean～sb/sb's arm 靠在某人身上/某人胳臂上;have sth～one's mind(fig) 把某事牢记在心;

(2)在(当)……时(on the occassion of or immediately after and usu in consequence of)：She was joyful～Robert's arrival/seeing her child take his first steps. 罗伯特到来之际/看到孩子初次迈步走路时她高兴万分。She went into mourning～her husband's death. 丈夫去世时她感到很悲痛。

(3)临(逼)近(in or into complete or approximate contact with)：(enemy/winter) be～us(敌人/冬天)向我们逼近;Christmas holiday is～us. 圣诞节临近。

(4)在(某一点)上，对;在……中(with regard to;about;in the course of)：discussion～the subject有关某主题的讨论;effect～students对学生的影响; attack～sb 对某人的攻击;be firm～that issue 对那事态度坚决;go further into the matter～the journey 在旅途中对此事进一步研究;be away～a visit外出走访不在家;congratulate sb～the phone在电话中祝贺某人;die～the same day 死于同一天;

(5)一个接一个(好多)(followed by)：pile book～book 把书一本一本摞起来;suffer disaster～disaster接二连三遭天灾;The woodland stretched for mile～mile. 林地绵延数英里。

(6)用在固定成语中(大部分可用on代替)：depend/insist/live～sth 依靠……/坚持……/以……为生;base/concentrate...～sth 把基础放在……上/专心于……;pride oneself～为……而自豪;bring shame/impose sth～sb 给某人带来羞耻/把某事强加在某人身上;go～a fact遵循某一事实;touch～a subject触及一个话题;work～sb (sth) 努力说服某人(致力于某事);be based/resolved～基于……/对……下定决心;look～sb as 把某人看作……;take it～oneself to 承担(去做某事的责任);Once～a time there were three bears and a farmer. 从前有三头熊和一个农夫。

【说明】upon和on在很多情况下可以互换，但upon是fml或lit用语;而on用得多一些，特别是在口语中。但在后面不紧跟宾语时用upon则多见，如：They don't have enough to live upon. (他们没有足够的衣食来源。)They had no evidence to go upon.(他们没有证据可依。)