38 ．fight against with / fight for
fight against：与……战斗 反对……的战争，可与fight with互用；但fight with还可表示“和……并肩作战”。
例191：They are making great efforts to fight against / with pollution .他们正在努力与污染作斗争。
例192：In World War II the British fought with the French and the Americans against the Germans 在第二次世界大战中，英国人同法国人、美国人一起与德国人交战。
And it has been an honor to fight with you! 和你们并肩作战是我的光荣！
fight for：为 争取 ……而战斗。
例193：The slaves were fighting for freedom .奴隶们为自由而战
例194：He said he would fight for his motherland 他说他要为祖国而战
I had a fight with his mother. 我和他妈妈吵架了。
You said you had a close fight with him. 你说了你和他贴身搏斗的。
39 ．find / find out / look for
find：发现 无意识地 ；找到 有意识地，是look for的结果 。
例195：When I got there I found my pocket picked 当我到那里时，发现口袋被扒了。
例196：Scientists have found new ways to clean waste 科学家已找到清理废物的新途径。
find out：查明，查出。指经过探听、询问、调查之后查明、弄清。
例197：Please find out who broke the window 请查清楚是谁打破窗户的。
look for：寻找。
例198：I have been looking for my pocket dictionary but I haven’t found it yet 我一直在找我的袖珍词典，但是还没找到。
40 ．forget / leave / remain
forget：忘了 带某物 。
例199：Oh no I’ve forgotten my key to the office .哦，不，我忘记带钥匙去办公室了
leave：把 某物 / 某人 忘 / 留在某地 后面要跟地点 。
例200：Oh no I’ve left my key at the office .哦，不，我把钥匙忘在办公室了
例201：Don’t leave your child alone at home .别把孩子一个人留在家里
remain： 某人 留下来；仍然 保持 。
例202：The refugees were allowed to remain in that area 允许难民留在那个地区。
例203：The boy remained silent .那男孩保持沉默
41 ．go out / be out / put out
go out：熄灭 自然熄灭，无被动结构 。be out：熄灭 表示状态 。put out：扑灭。
例204：The light went out suddenly and it has been out for quite a long time .灯突然灭了，已经灭了很久了。
例205：The big forest fire was put out at last .森林大火终于扑灭了。
例206：Nobody noticed the thief slip into the house because the lights happened to go out . 没人注意到小偷溜进了房子里，因为当时灯刚好熄灭。
例207：When the firefights arrived the fire had gone out / been put out 消防队员到达时，火已经熄灭/被扑灭。
42 ．happen / occur / take place / come about
happen：发生。带有偶然、未能预见的意思，主语为事；当针对人时，意为“碰巧”。
例208：This happened on a December evening .这发生在十二月的一个晚上
例209：What happened to him?他怎么了？
例210：I happened to meet Tom in the street when I went shopping today .我今天去购物的时候碰巧在街上遇见了汤姆。
例211：It happened that I met Tom in the street when I went shopping today .我今天去购物的时候碰巧在街上遇见了汤姆。
occur：发生 既表示偶然地，也表示必然地 ；被想到。
例212：When did the accident occur ?事故是什么时候发生的
例213：The tide occurs this time every year 潮水每年这个时候出现。
例214：A fresh idea suddenly occurred to me 我突然有个新主意。
take place：发生。指事先布置或策划好而后发生。
例215：The May fourth Movement took place in nineteen nineteen.五四运动发生在一九十九年。
come about：产生。指自然产生。
例216：How do the differences between British English and American English come about ?英国英语和美国英语的差异是如何产生的？
43 ．hear / listen
hear：听见；听说。它既可以表示偶然听见，也可以表示有意识听的结果；用作“听说”的意思时，后接宾语从句。listen：听，倾听。它是不及物动词，常与to连用；侧重听的过程。
例217：I was walking along the street when I heard my name called .我在街上散步时听到我的名字叫 此处是无意识听到
例218：I hear that he’ll be back in an hour . 我听说他一小时后回来 此处是听说
例219：He listened but could hear nothing . 他听着，但什么也听不见。 此处是有意识听的结果
例220：Speak louder so that everyone can hear you clearly .大声点，让每个人都能清楚地听到你说话。
例221：Speak louder to make yourself heard 讲大声点，以便能使你的声音让别人听到。
例222：The music is well worth listening to 音乐很值得听，
44 ．hear of / hear from
hear of：听说 人或事 。其后常接名词或代词。
例223：I’ve never heard of such a man .我从来没听说过，这样的人
hear from：得到 某人的 音信，收到 某人的 来信。
例224：Have you heard from him recently? 你最近有他的消息吗？
例225：I’m looking forward to hearing from you soon .我很期待很快收到你的来信
45 ．help / aid / assist
help：帮助，帮忙。是普通用语，常用在日常谈话中。
例226：May I help you with your luggage ?我能帮你拿行李吗
例227：We helped him to mend his bicycle .我们帮他修理自行车
aid：帮助，援助。是比较正式的用语。
例228：The flooded areas were aided by many countries 灾区得到许多国家的援助。
assist：帮助，协助。是比较正式的用语，强调起协助作用；其名词assistant是“助手”的意思。
例229：She assisted me in the experiments 她协助我做实验。