instructor的英文怎么说_翻译

1.请求帮助
  The problem is I`m still having trouble with my English. My instructor suggests that I ask an American to help me. If I don`t know how to say some things in English I can ask him. I want you to be the one.
  问题是我的英语还是没有进展.我的英语老师建议我找一个美国人帮助我.如果不知道怎么用英语表达,我可以问他.我希望你来做我这个朋友.

2.在书店
  The books are arranged by course number and instructor.
  所有的书都按照课程编号和任课老师来排序的.

3.喜欢街舞
  Not exactly. The participants and the instructor are dressed in their ordinary casual wear. Moreover, the music they use is not the dancing music that an aerobics class usually uses.
  不完全一样.学员和领舞都穿着他们平时穿的比较随意的便装.还有他们用的音乐同健美操班常用的音乐也不同.

4.可惜我帮不了你
  I should have had time off, but now the instructor asked me to help me to do the experiment. I am so sorry.
  我本来是有的，但是我的老师叫我帮他做实验，我很抱歉。