There is nothing wrong with the sentence ”He keeps an English diary" but I'm not sure it is a very good translation of this sentence. The problem is that "English diary" is too ambiguous - you believe it means a diary written in English, but someone else may think it's a diary bought in England and yet another person may think it's a record of his progress in his English studies. You can always ask for your sentence to be accepted if you don't agree.
In Portuguese, I think, those meanings are distinguished like this (respectively):
Um diário em inglês;
Um diário inglês;
Um diário de inglês.
Is it correct?
Alright, i see your point. I have reported it anyways just to see how our portugues native speakers feel about it.
Does "Mantém" have a special rule for conjugation? I would think that this particular conjugation would be for Eles/Elas.
It is an irregular verb related to "ter" and the "eles/elas" conjugation is "mantêm". See: http://www.conjuga-me.net/verbo-manter
Without the accent "mantem" would be pronounced "MAN.tem" but Portuguese requires the "ele/ela" present tense forms to be stressed on the final syllable.
In the audio test it sounded to me like ele nao tenho um jarro em ingles. I had to give up in the end, those j/d pronunciations got me again.
I got it this time - progress. Still not sure what it's got to do with travel though.
No, but i mean it's wierd if you say it like that, I mean I suppose it's more common to say keep. Btw my english is not THAT good so i'm just saying... but I think it's like that.
I'm a native speaker of English and "maintains a diary" doesn't sound weird to me. You are right about your second point though, a crude Google n-gram test shows that "keeps a diary" is much more popular than "maintains a diary".
English is my first language as well, I thought that as translations go maintain was fine for mantém but I was marked incorrect. Keep is certainly more common and fitting, I agree.
Journal in English can mean different things: newspaper = o jornal, magazine = a revista, diary = o diário.