I just came across this on WeChat: https://mp.weixin.qq.com/s/pGj9u7kmSKntcjr5DxNyTw
It gives helpful examples of some useful phrases.
There may be more useful tips from the same author (Weixin ID greatwritingtips), but I haven’t checked them out myself.
Here’s another from the same author. This one is specific for task 1:
https://mp.weixin.qq.com/s/q–TXuoyZ1u9WQWBormATA