5. I have worked overtime for the entire week.
我一整周都在加班。
还能这样说：
I've worked overtime for the whole week.
I've worked the entire week overtime.
应用解析：
entire affection 纯真的爱情；
entire function 整函数；
an entire horse 未阄过的马，种马

6. I'm going to work this Saturday.
我这周六要来加班。
还能这样说：
I'll work overtime this Saturday.
I intend to work overtime this Saturday.
谚语：
Something must be done about it.
必须得想个办法。

7. We often work overtime at the end of the month.
我们月底经常加班。
还能这样说：
We usually work overtime at the end of the month.
Usually at the end of the month, we have to work overtime.
谚语：
All is well that ends well.
结局好就一切都好。

8. Is it okay to work overtime tomorrow?
明天来加班行吗？
还能这样说：
How about working overtime tomorrow?
Could you work overtime tomorrow?
谚语：
Frugality is an estate alone.
节俭本身就是一宗财产。