1。回来hui2 lai2,这是两个字的分别读音.实际发音应该是 回来hui2 lai0，其中lai是轻声，无声调，北方人的发音接近lai4。您听到电视里的发音是正确的。同样情况很多，比如妈妈 ma1ma0 NOT ma1ma1, 桌子zhuo1zi0 NOT zhuo1zi3。 / Hui,lai are pronunciation for 回来 separately. when they come as a word, there is no tone for 来， and in northern area, it sounds like it is hui2 lai4. same situation applies to 妈妈 ma1ma0, 桌子zhuo1zi0 , so you need to know when is the status for zero tone. 2。您写的 比较bi3 jiao4 是正确的。通常北方人口语中发音是bi3 jiao3，不是bi2 jiao3。 People in northern area are used to say bi3 jiao3.

将比较"读作"bi3 jiao4"和"bi2 jiao3"的都很常见的,但将"回来"读作"hui2 lai4",我还是第一次在这里看到.

You are right."回来"作为词语在口语中常被读作hui2lai0,"来"读成轻声.但二者独立时都是二声.在普通话中,"比较"读作bi3jiao4,实际上bi3jiao3是一种不规范的读法.I hope you are clear now.

This is very interesting indeed ...so when it is three 3rd tones in a row, it should be pronounced 2nd, 2nd, 3rd ... am I correct? For instance, 我也想...should be wo2 ye2 xiang3... right? What about if it's four 3rd tones in a row? Should it then be 2nd 3rd, 2nd 3rd? For instance, 我也想打 should be wo2 ye3 xiang2 da3? 真有意思...那么当有三个第三声的字连续出现,是不是应该读成2声,2声,3声? 我说得对吗? 比如"我也想"... 应该是wo2 ye2 xiang3.. 对吗? 那么如果有4个第三声的字连续出现该怎么读了? 是不是 2,3,2,3呢? 比如"我也想打" 应该是 wo2 ye3 xiang2 da3? (Please correct me if I have also made any mistakes in this Mandarin translation itself). 谢谢...

that is different between cities. u do not mind the tone ,just learn the standard. best wishes!