I syudy by listening to tapes.这句中by的意思是什么?

I syudy by listening to tapes.这句中by的意思是什么? I study by listening to tapes.是什么从句? by listening to tapes翻译 "I study by listening to tapes"中的"by"有什么用 1 by 2 study 3 listening 4 to 5 I 6 tapes She learn English (by listening to tapes)(对括号提问) by listening to tapes为什么要加ing She said she ____ her listening skills by listening to tapes I learn English by listening tapes （对划线部分提问,后三个） He learned songs by listening to tapes.(对画线部分提问） He learned songs by listening to tapes.（对画线部分提问） l study by listening to tapes for the test .对划线部分提问 划线部分by l