语言用英文怎么表达？

　　It takes a long time to learn to speak a language well.

　　学会说好一种语言需要花很长的时间。

　　The fashion at the time was for teaching mainly the written language.

　　那时教学时兴的主要是书面语。

　　A good dictionary is indispensable for learning a foreign language.

　　一本好词典是学习外语必备的。

　　Is English an official language in your country?

　　英语在你们国家是官方语言吗？

　　Why study Latin? It's a dead language.

　　为什么学拉丁语？它已经不再有人说了。