That is an apple of the tree,如果这后面要跟名词性同位语的话，是修饰的apple还是tree呢？这里同位语不能修饰定语吗？谢谢老师了！

That is an apple of the tree.

解答如下：

根据写英语句子主观意图，后面可以接“an apple”和“the tree”的同位语,即把前面出现过的名词“an apple”和“the tree”分别用另外一种方式再描述/表达一次。

(1)That is an apple of the tree,the one eaten by Tom just now.

the one eaten by Tom just 为“an apple”的同位语

(2)That is an apple of the tree, the one planted by us three years ago。

the one planted by us three years ago 为“the tree”的同位语

总结：可以根据说话人主观意图和语义逻辑，可以自由设定/设置名词“an apple”和“the tree ”的同位语