1. The deadline is coming up.
截止时间就要到了。
还能这样说：
It's getting down to the wire.
The work is due.
谚语：
Many a little makes a mickle.
积少成多。

2. I have to work overtime today.
我今天要加班了。
还能这样说：
I must work overtime today.
I need extra work today.
应用解析：
be on overtime 在加班；
overtime pay 加班费

3. I have to finish this up for tomorrow.
我必须把这个做完，明天要用。
还能这样说：
I must finish this up for tomorrow.
This has to be done for tomorrow.
应用解析：
finish因完成而结束；
complete全部结束；
end终止正在进行的事；
conclude按照预定予以终结

4. I have to work overtime today to get it done.
我今天不得不加班才能干完。
还能这样说：
If I want to finish it, I must work overtime today.
If I work overtime, I think I can finish it.
应用解析：
No sooner said than done. 说到做到。
Well done! 干得好！