题目内容：

那为什么 I like reading books which were written by O Henry.是正确的
那为什么
I like reading books which were written by O Henry.是正确的
而I planted a tree which is taller than the house是错的呢?
还是不太明白!

优质解答

I planted a tree which is taller than the house单独写出来,当然是正确的,问题在于它前面有个主句啊,它是从句的成分,必须把它修饰的成分换成which或者that