make a living by 后跟－ing还是－do

make a living by 后跟－ing还是－do make a contribution to+do还是ing I really do make a living by laughing?啥意思? make a living by doing make a living是否可以省略by make a living 后面的介词是by 还是on?还是两个都可以,区别是什么? 把“Do you make a living by playing the violin?"加上时间状语las Do you make a living by playing the violin? the old man said Do you make a living by playing the violin?如何翻译? Practice后跟不定式还是ing I get to school by bus.变特殊疑问句后面不加ING到底是句子的变化还是do后跟原形 make a living by driving和make a living as a driver,