1）go by对应的是时间 半个小时过去了 末班车还没来指 从半个小时前直到现在还没来 适合用现在完成时 只好可以用表达：have no chice but do
A half hour went by ，but the last bus has not come yet.We had no chice but go hone on foot.
2）主句：Mary看上去很担心 其原因是没有背熟课文 有两种翻译：Mary looks worried for/because .../The reason why Mary looks worried is that...
Mary looks worried about the Chinese test，because/for she doesn’t learn the text by heart.
3）既然：now that or since 不妨might/may（just）as well
Now that the basketball match has been postponed ，we might as well go ti visit museum.
PS：篮球赛已经 被推迟 表明应用过去式 并且被动
4）主句：他一直和父母住在澳大利亚
在什么期间during
He lived with his parents in Australia all the way during The Second World War .
5）主句：我和我的大学同学失去了联系（my schoolmates and I kind of lose touch...）
自1985年至今 应当用现在完成时since graduated from NJ university
Since I graduated from NJ University ，it could be said that my schoolmates and I have kind of loat touch with eachother.
七班 兰月
