An English Teacher

Today we invited a foreign English teacher for our students.
They talked a lot, but I found there is a lot of faults which they didn't realize (In American English it's "realize", in British English it's "realise", I think) in their sentences.
I know they can write correctly, but they can't speak very well. Even if they know the words they want to use, they don't know how to use them.
That's so bad.

Good job! I think that speaking in another language is very difficult because it's such a spontaneous process which can only be corrected with practice. And if you don't have very many opportunities to practice, you won't have very many opportunities to improve yourself either. Very few people choose to speak a foreign language when they can speak their native language, especially among peers. I think that as long as one can communicate one's thoughts, even if they're riddled with mistakes, that's what's most important, along with having the confidence to speak out in the first place.

An English Teacher

Today we invited a foreign English teacher for our students.
They talked a lot, but I found they were unaware of the mistakes that they were making. 
I know they can write correctly, but they can't speak very well. Even if they know the words they want to use, they don't know how to use them properly, which is a shame.