Cannot express

Don't worry. I'd say it is a fairly common problem. I am sure some people here we'll be able to help you.

I don't know if you read any English newspaper regularly. Start doing so if you don't. And from the newspaper, write down different phrases and sentences and try to use them in your daily speach. I hope it would improve a lot.

That's a wonderful piece of advice.

I can sympathize with you for I have the same problem. Reading helps me a great deal. When I read I picture myself saying the same thing that the author wrote. Be very careful with this though, because some books are not well written. I read mostly biographies, especially ones about interesting people such as Abraham Lincoln, Eleanor Roosevelt, Serpico, etc. Auto biographies do not interest

Most of the time we are just looking for the appropriate word for the thing we need to express you have the same problem as i had on

That is a wonderful piece of advice.

I have the same problem, especially, when I speak the target language. The teacher advises us to read more, I think it really help us to improve our ability to express ourselves. It is better to choose a magazine and keep reading it. After a period of time you can see the fruit. Remember it needs time.

This is a wonderful piece of advice.
I will try it then