Ever since放句首和放句末一样吗

Ever since放句首和放句末一样吗 ever since 和 since then 意思一样吗?请详细说一说他们的用法和区别.thanks ever since 和since 的用法和意思有什么区别是不是一样的? since ever 和 since then 有区别吗字面上意思是一样的一个是在那之后,一个是从那时起 ever since 的用法ever since 和什么时态连用? ever since 和since 有什么区别Mr li went to America 20 years ago and has bee there ever since.后面为什么是ever since?不是ever since要和现在完成时连用吗?这里怎么会是过去时态啊? Since that和 since then是一样的吗?为什么? ever since ever since,ever after ever since是什么意思,和什么时态连用? ever since和since有什么区别,怎么用? ever since的意思,与since有区别吗 ever since 是一个词组吗? 请问Since ever和ever since分别是什么意思?有什么区别? later on和ever since的意思和区别是什么? ever since可以直接等于since吗We have lived in Shanghai ever since we came to China .（可以把every since换成since吗） 和ever since同个意思的有哪些词组? from ever since和since then和after that time和from then on的区别?