go back on . go back upon . fail to  keep（a promise，an agreement，）；fail to  be loyal to违约；背弃

Never go back on  your friends．绝不要背弃你的朋友。

He's not the sort of  man who would go back on  his word．他不是那种不守信的人。

When you make a  promise，you must not go back on  it  ．当你许下诺言时，就不可食言。

I'm afraid that I will have to  go back on  my word for I am now hopelessly ill in  bed．恐怕我要食言了，因为我现在重病在床。

go bad . turn sour；start to  decay变质；变坏

Don't drink this milk；it is  gone bad．不要喝这个牛奶，它变质了。

go behind . search for寻究；推敲

If you go behind what he says，you'll find he's not really enthusiastic about the plan．只要你听他的弦外之音，你就会知道他对那个计划并不真正热心。

go behind . reexamine the grounds of进一步斟酌

The manager said that he was going to  go behind the decision．经理说他要对这一决定进一步斟酌。

go between . fit well into a  position between；pass between放在…中间合适；做中间人

The picture goes nicely between the portraits of  your father and mother．这张画放在你父亲和母亲的照片中间正合适。

He went between the two parties．他为双方调解矛盾。

go beyond . pass；exceed 经过；超过；越过

As the ship went beyond the horizon，it appeared to  sink until it  could be seen no longer．当船越过地平线时，看上去就好象在下沉，直至消失。

All the people present were wild with joy，for the results of  the experiment went beyond their expectation．所有在场的人都高兴得发狂，因为实验结果好得出乎意料。

That's going beyond a  joke．那样开玩笑未免太过火了。

The control of  the children is  going beyond my power．要我管住这些孩子实在是无能为力。

You have gone beyond our orders．你的做法已经越出了我们的指示范围。

go by . pass by走过

You've missed the bus；it just went by．你错过了这趟公共汽车，它刚开走。

We waited for the procession to  go by．我们等队伍过去。

go by . be guided by  something giving direction靠…指引（方向）

Having no map to  go by，we soon lost our way．没有地图判断方向，我们很快就迷了路。

go by . act according to；be guided by照…办事

We should have a  clear-out criterion to  go by．我们应有明确的标准去遵循。

We have a  precedent to  go by．我们有先例可循。

If you ride a  bicycle，you must go by  the traffic rules．你如果骑车，就必须遵守交通规则。

She always goes by  a  pattern when she makes a  dress．她总是照式样裁制衣服。

go by . judge by；form an  opinion by；trust as  being correct判断；凭…而判断；以为…是正确的

You can't always go by  appearance．你不能老是以貌取人。

We can't go by  that clock；it is  hardly ever right．我们不能以那个钟为准，它很少对过。

You can't go by  one person's opinion；you must ask everyone what they think．你不能光凭一个人的意见就下结论，你得问一问大家是怎么想的。

go by . （time，days，weeks，）pass；elapse；go on（时间等）流逝

Three years have gone by  since we came to  this university．我们进这所大学已3年了。

This event will be forgotten as  time goes by．随着时间的推移，此事将被遗忘。

go by . （opportunity，chance，）pass without being used or grasped（机会等）轻易地放过

Don't let this opportunity go by．不要错过这个机会。

John hesitated just a  little too long over the offer of  a  partnership in  the firm，and when he finally made up  his mind to  accept，the opportunity had gone by．约翰对别人主动要和他合股开商行迟疑的时间稍长了一点，等他下定决心同意时，机会已经错过了。

go by . be known by；be called为人所知；称为

Many actors do not go by  their real names．很多演员的真实姓名不为人知。

go by . stop for a  short visit 短暂的走访；顺便走访

“Have you seen Mr．Wang lately? ”“Yes，I went by  his house last week．”“你最近看到王先生了吗? 看到了，我上周顺便去他家了一会儿。”