I'm a native speaker of standard Mandarin and southwestern Mandarin [which is different from the former in tones, words and some pronunciation], I'm strengthening my English, and I'm now learning, as you can see in my profile, Japanese, Korean, German, Icelandic, Faroese and Slovenian;

Because they are different languages, so I have different problems when I learn them.

English...

the most challenging could be> verbal phrases [verb + preposition], vocabulary [English has too many words!!!], synonyms, as an English learner, I think I don't have major problems in communicating in oral or written forms, but I'm trying to solve all these problems to use English naturally just like native speakers.

Japanese and Korean

Well, Korean and Japanese have many 漢語/漢字語(한자어), so I find it not so hard to master Japanese and Korean vocabulary, but I have to say that 音讀 and 訓讀 are a bit tricky to me; and both J and K have hundreds or thousands of sentence endings, It takes much time to memorize all of them

German

Hmmm, because I know some basics of Old English, which has some similarities to German but is more complex, I don't have trouble learning German morphology. But the problem is I have got used to thinking in English, word order of German sentences is a pain to me and it's hard for me to put words in the right order; I haven't learned German long so it could take some time to master it.

30天中文写作挑战 (19/30) – 对烟卷法国规则

和我之前标注的颜色一样: 蓝色-我觉得更好的表达; 红色-错误改正

1. 一些年前, 很多法国人抽烟(了), This sentence is a pure statement, so you don't need "了", because 了 means something one has experienced or done (in some sense)

2. advertise/advertisement> 广告

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19 days into my challenge, I tried to talk about a more serious subject. Thank you in advance for your help! Here is the English translation:

Some years ago, many French people were smoking, it was a trend. But as it is bad for people's bodies, the French government decided to take countermeasures. Since 2008, you cannot smoke in public places: transportation, schools, companies, restaurants … Tobacco companies also cannot advertise their products. The Young people under 18 years old cannot buy cigarettes. Moreover, cigarettes are a very heavily taxed products: between 2000 and 2016, the price of cigarettes has doubled. I hate cigarettes, I don’t know why so many people enjoy them, so I think that those measures are very good.

* I searched some English newspapers and they use "the French government xxxxx" with the definite article

http://www.independent.co.uk/news/world/europe/french-government-threatens-to-ban-demonstrations-after-attack-on-hospital-a7084306.html

According to my personal learning experience, the best way to practice listening is "listening to" films again and again until you understand every word of it and even can read some lines when certain scenes appear. I majored in English at college, my classmates struggled to improve their listening, but I never focused on news or any textbook audio, I only listened to films, I even listened to some film more than 10 times

But I'm not saying my learning method is the best, but the "result" is effective, I can understand what people talk about or watch TV, talk shows, speeches, movies without subtitle, and I can even understand many non native accents (well, mostly, not always though). I'm not clever so I have to be diligent, and I think repetition is rather important because you need to repeat things so they can be "rooted" in your brain permanently, maybe to some people not permanently, but in a long time. So in some degrees repetition is a practice to help someone build up a reaction system to the target language.