短語精學：

go forward

1. 向前，前進：
The students went forward at dawn.
學生們天一亮就出發了。

2. 進行；取得進展：
Their work is going forward well.
他們的工作正進行得很順利。

3. 發生：
What's going forward downstairs?
樓下發生了什么事？

4. 被提交：
The suggestion went forward to the board of directors.
建議已提交給董事會。

5. （夏令時間開始時時鐘）被撥快：
The clocks go forward in the spring.
春季時鐘要撥快。

句子表達：

Take great care, because they must not know that somebody is watching them.
謹慎行事些，因為他們不該知道有人正在監視他們。

take care 注意；小心

eg. He or she should also take care not to share food, drinks and eating utensils.
他（她）同時也要注意，不要與別人分享食物，飲料和其他的餐飲用具。

must not 不可以；不允許；不準

eg. It must not be allowed to do that this time.
這一次絕對不允許此類事情再次發生。