however作为转折用必须要和后面的句子之间加,请详解

Question

however作为转折 用必须要和后面的句子之间加 ,
请详解

Answer 1

无论用在句首,句中,however 后面一定要加逗号.比如:We will go to Beijing next week.However,if the weather there is too cold,we may have to change our plan.
A great majority of people are,however,still not rich.