she thinks Jhon is not a good student.这个句子对吗？

I don't think Jhon is a good student.这是一个否定前置的句子,前提是主语是第一人称.我想问,如果主语是第三人称,或第二人称,是否需要否定前置.例:She thinks Jhon is not a good student.对吗？还是应该写成She doesn't think Jhon is a good student.之前有人提过类似的问题，但回答得不明确，有点答非所问，希望得到更精准的回答！``期待！~

she thinks she can get there on time ,___she ? 请教：She thinks she can draw better, doesn't she 还是can't she? She thinks Tom is a cute boy ，-----------？反意疑问句？ She thinks she is smart because she has a good quality of self-confidence. 刚才的打错了，在发一遍she thinks she can get there on time ,___she ? -what dose she think of the transportation in zhengzhou?-she thinks it's____. Laura never thinks she gives more then she gets.(翻译句子) She thinks Tom is a cute boy .的否定句和反意问句？ 1.She thinks spicy sausage is delicious(对is delicious提问) l think he is right he thinks she is right 的反意疑问句