How do you define a person can speak a certain language? For an example, what does it mean if somebody says he can speak English?

Is it impolite to call others as "tu" in French?

Why do some native English speakers pronounced "ton" "tain" " tan "sound as the "n"sound? For example, certain, they pronounce CER-N, Britain, they pronounce BR-N.

In your culture,how do teachers usually punish students who made mistakes?

What is(are) the hardest language(s) for you?And why?

Fill the blank. He is playing ______ new violin. A. a B. / C. an D. the

私はすべての理科の教科が大好きです。それは面白いからです。しかし、多くの人々は理科の教科は難しいと思い。そうですね！特に数学は一番難しいと思います。私のクラスでは、クラスメートは数学の授業が嫌いです 。私たちの数学の先生は厳しいです。

Look at following math problem, tell me the answer and explain why. When Andrew was 4 years old, his sister Amy was two times his age. Now, Amy is 35 years old,how old is Andrew?

Anyone interested in math? Look at the picture, what do you think of the answer? And tell me why.