what is your brother majoring in in the university?为什么major要加ing

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• 在英语的问句中 什么情况下某些词要+s 比如动词,名词 什么时候尾巴要+s 什么时候要加ing 陈述句中呢比如1 What's your favorite sport 2.He likes sports very mucn.3.His favorite sport is basketball 为什么第一句中的sport的尾巴不加s 而第二句要呢?为什么第三句又不要呢?还有 问句或陈述句在什么情况下 动词 或名词要用原形呢在英语的问句中 什么情况下某些词要+s 比如动词，名词 什么时候尾巴要+s 什么时候要加ing 陈述句中呢
• what is your brother majoring in in the university?为什么major要加ing
• have you been fighting against your brother again?这就话是说："你又和你得兄弟打起来了吗?"这句话的意思我明白,可是时态我老是搞不明白.这句话的肯定形式是：you have been fighting against your brother again.这是什么时态?fight为什么要加ing 为什么要加been,直接写成you have fighted against your brother again.（用现在完成时）不行吗?那么疑问句应该是：have you fighted against your brother again?难道这样写不对吗?我好困惑请赐教!
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