I can't understand why her singing gets worse when I listen.
I'm delighted that your Na'vi is improving every day
Those words of yours have only made the situation worse.
The worsening of his depression is very disappointing.
Please improve this explanation. It's not at all clear.
The situation with the Skypeople hasn't improved one bit.
You speak really well now. As your teacher, I'm proud of your improvement.
Without practice there is no improvement.
Do you have any suggestions for improvement?