his father has a bike sells in the market

sells- sold
这里是have sth done 的句型。使某物遭受某种状态。

sells 改成 sold

His father has a bike sold in the market.

his father has a bike sells in the market
你会发现这个句子中有两个动词 has 和sells 着是不对的不符合语法规则的 将第二个动词变成非谓语形式就好了
可以说：2.His father has a bike sold in the market
1.His father has a bike that sells in the market
还有其他的变法 呵呵 成功

sells改成sold（即which was sold）

有两个谓语啊~~~
学英语要记住一个句子不可能同时拥有两个谓语（从句除外），所以要用SOLD作后置定语。
他爸爸有一辆在市面销售的自行车。
那么SOLD就是作定语定那个自行车。是什么样的自行车啊？哦，原来是”在市面上出售的”自行车。