想请教大家个问题，用Where的问句
1. John has gone to Taipei.
→ Where has John gone?
这边就我所知，是不用加to的
2. Jane walked to the park yesterday.
a. Where did Jane walk yesterday?
b. Where did Jane walk to yesterday?
不知道要不要加to呢
如果是a.的话，回答不是应该是 Jane walked in the park yesterday. 吗？
还是说这类改问句是Where开头的是不用加介系词呢?
谢谢大家