Many Chinese students who have already learnt English more than ten years are still unable to speak English properly and fluently when they encounter (遇见) a foreigner. They have been able to master the basic language structure and many other things grammatically, but a conversation in English will make them feel uneasy. They are afraid other people might largh at their mistakes or they think those to whom they are speaking might not understand them.
It is not uncommon that many students, who are bad speakers of English, write beautiful and fluent English.This proves perfectly that they do have the ability to organize their ideas in English. The problem is that they do not have enough practice and confidence..Maybe they are afraid of speaking English openly.
The best way out, as a result, would be a bit more confidence and practice. No one would laugh at you even though you make some mistakes for they understand English is a foreign language to you. Don’t care too much about the small mistakes you may make in your conversation because you can correct them easily if you practice enough. But you do have to take great care to make people understand what you are trying to say. If you keep practicing English all the time, you will surely find that talking with a native speaker is not at all difficult.

Many Chinese learners of English are weak at speaking because（）.