i study by having conversations with friends在线等!为什么have要变having
问题描述:
i study by having conversations with friends在线等!
为什么have要变having
答
by 是介词,后加名词或动名词
He saluted her by raising his hat.
他举起帽子向她致意.
They sold apples by catty.
他们按斤卖苹果.