BEP

It’s important to think of the situation and the source because that might help determine whether the criticism is constructive or destructive
- constructive
ممنون می شوم اگر گرایشی سازنده به مشکل داشته باشی تا اینکه فقط در موردش شکایت بکنی

- helpful or useful
+ I’d appreciate it if you took a more constructive attitude to this problem rather than just complaining about it