1. Try not to appear some abbreviations, they should not appear according to regulations
2. Avoid unnecessary there is and there are
There are many teachers work hard every day换成
Many teachers work hard every day.
3. Avoid using Really, every, a lot, so
Many students think math is very hard→isdifficult (no modifiers, but a stronger word)
He is really smart→is smart (this will make the whole sentence clearer)
A lot of parents ……→Many parents
A lot of time is wasted→Much time
4. Try to avoid negative words and use positive words (passive is a negative voice)
Healthcare reforms were implemented by Obama 被动语态：be implemented by
Obama implemented healthcare reforms.
The war was won by the Frech→Frech won the war
5. Use more powerful words (if you replace an action with an action plus a noun, then you weaken your action)
weak：He give assistance to my friend；strong：He assisted my friend.
weak：Make a objection；strong：objected
weak：conducted an investigation；strong：investigated
Organized from: https://v.qq.com/x/page/u0618sh482t.html?start=726