"I study by listening to tapes"中的"by"有什么用我在预习,急用!

I study by reading the textbook. i study english by taking p___ I study by working with my friends. I study by listening to sapes. I study by working with friengs?急用!应该是I study by working with friends. 关于study的问题：I study by working with friends ,这时,study I will study hard and make progress bit by bit. i always study by (work) with a group 英语翻译I study by working with a group 翻译：I study by working with a group. I study it by listening to the radio 填空 ：I often study English by making f-------- I study by listening to tapes.是什么从句? I study for a test by working with a I study by making flashcards for a test 翻译 I study for a test by making v______ lists How do you study (for )a test?I study (by )working(with )a group. How do you study for a test? I study by working with a group.什么意思