My Opinion on Overtime Working

My boss's secretary handed her notice in last week because of her working overtime so often. She said she hadn't got a whole weekend in several months and never get paid extra.

It is not legal in China to ask employees to work overtime without paying extra, but these things are it is very common in many cities. Most emplyees don't ask for help from the government, they just leave the companies they aren't content with.

General Notes:

--Instead of "handed her notice..." There are a few more common ways to express this: "Handed in her resignation" or "Gave her two weeks notice" (giving notice that you are leaving a company in however many days is common in the area).

--Use of "never" better describes something that occurred all the time, no matter how many times. "Didn't get paid extra" sounds fine, but the event you are describing happened too often, as it occurred over 'several months'.

--Because the opening sentence in your second paragraph describes something general and applicable to everything (namely Chinese labor laws), you would use an infinitive ("to work") to have it apply to everything.

--You should never start a sentence with "but," but you can easily have it be part of the sentence and use a comma (,) instead of a period (.) there.

--As your opening statement describes something general, you would still use an infinitive ("it is") instead of a plural "these things are." "These things are..." would be suitable if you were talking about more than one item as the subject (exmaple: Chinese labor laws and business practices).

--When you use "...content with." You use the verb 'to be' ("are") as you are talking about something that effects a person. There are other words you could use as well: "...companies they aren't happy with."