Student or Learner
HI! I need your help.
Is it right to use idioms in a formal piece of writing?
There are some who say no. There are some who say yes.
If you are a student, then use the answer given by your teacher.
If you are an employee, then use the answer given by your boss.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.