→ concen:意思是，像兩個句子間沒有連接詞，或是一些文法錯誤(譬如 01/27 11:47
→ concen:help的用法)，她們知道正式用法，只是沒有用而已? 01/27 11:48
→ concen:要求她們"寫信中"使用，她們會不會覺得麻煩呢? 01/27 11:49
Oftentimes, language exchange is about casual conversation rather than serious
English classes. I'm not meaning it can't be serious, but naturally we don't
tend to take language exchange for a formal occasion in which one gotta speak/
write perfect English.
If formal way of talking/writing in English is what you want, I suggest you to
make it clear to your exchange partner that "the English you prefer learning
from him/her is perfect in grammar, is something you can use in formal
circumstances." I believed that she/he will make adjustments after knowing what
exactly your needs are.
FYI
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