I'm a senior three student. I think we can be friends

不但不。。反而 /不久

不但不。。反而

-我朋友不但不帮助我，反而给我麻烦This sentence is very good

- 我今天不但不吃健康的食物，反而我对晚饭才点McDonald's. (我晚饭还点McDonald's)

-- 照李李（Is this a Chinese name?Please change a name。That's not the right name）说泰国不但不贵，去一趟旅游，反而任何事都很便宜（This sentence is a little repeated. You can change it like this反而还很便宜）

不久

- 我从中国回美国以后不久会想回中国。（There's still something wrong） 从中国回美国后不久，我就开始想中国。 “想中国”There's something about wanting to go back to China

- 他从不去健身房锻炼，估计要是他一直不懒腰之前锻炼的话不久身体肯定会受伤(First of all, it's very important to break a sentence properly. If you keep making a sentence, it will be ambiguous。In case of ambiguity, we can't point out the wrong place for you。This is a bit of a problem)I might change it for you。他最近不去健身房锻炼，估计要是他不像之前一样锻炼腰的话，身体肯定会受伤。（从不去This means never been，一直Same as before，If you must use these two words，Please add a time limit for these words，I don't know what to say? Anyway, the mistake in the last sentence is serious。You can't express what you want to express）

Chinese is becoming more and more important now. Global learning of Chinese is a trend