He has a flower in his hand.（改为同义句）

很高兴能够在这里回答你的问题：
​（There is) a flower in his hand.
他手里有一支花.
再问： 可是 there is 只是说有一个，不一定是他的 he has
再答： 句子的后面有　in his had 说明在他的手里，自然是他有了