推荐回答（3个）
有时，康康乘地铁回家
Sometimes，Kangkang goes home by subway。（正确，sometimes后面不能有逗号。）
除非你及时完成作业，否则你不能参加这项活动
You can't take part in the activity，unless you finish the homework in time。（正确，不过unless也可以换成until,使用not until词组）
你能否不把自行车停在教室前面
Would you mind no parking the bike in front of the classroom？
（这句不大顺畅）。
Would you please not park the bike in front of the classroom?
或者 Would you mind parking your bike somewhere else instead of in front of the classroom?
我很难与他取得联系（difficulty）
I have some difficulties in keeping in touch with him。
(整体可以，但是取得联系这个词组，个人认为 get through to him更好。keep in touch保持联系，这里是指联系上。因此也可以用 get linked to/get connected with).
祝好！
你能否不把自行车停在教室前
would you mind not parking.........
大哥 我敢百分百确定你没错我都看了好几遍了一个没错
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