请各位英语达人分析一下句子成份,it is generally believed that some people ar

请各位英语达人分析一下句子成份,it is generally believed that some people are born with certain taents,for instance sport or music,and others are not.however,itis sometimes claimed that any child can be taught to become aqgood sports person or musician.discuss both these views and give your own opinion.请问itis sometimes怎么翻译啊,做什么成份啊?