We're not sure which ones yet.

问题描述:

We're not sure which ones yet.
We’ll visit more countries in Asia.We're not sure which ones yet.这是定语从句吗?为什么用ones?帮我分析一下句子结构呗,

这是一个省略句,省略to go
完整句子应该是We're not sure which ones to go yet我们尚没有决定究竟去哪些国家
因为前面一个句子We’ll visit more countries in Asia中告诉我们主人公要去很多国家,他们需要决定去的地方不止一个,所以countries要用ones代指,而不用one