Do you have this experience. Sometimes you want to say something in English, but you suddenly forget how to say. This thing might is right in front of you. You know how to speak the Chinese name of this thing.
When I come across this sort of problems. I will give up to use the more specific word,then trying to use some point words. Such as"this thing,those things, the red object". The other people you communicate with will understand you. The trick you have used so many times when you speak Chinese in fact.
So, in summary. If you can't say what you want to say, learn to want to say what you can say.