请问几个句子...

toola1

1.The srorm began worrying the passengers, but the captain's confidence
and cheerful laughter helped dispel theit misgivings.
这里的help 跟dispel是当什么词呢?应该不可能两个都当动词吧?怎么一个有加ed
(helped),一个没加?

2.这句该怎么翻呢?They believe it to be him.
3.Because of air pollution being greatly reduced,..
这里的being是当什么词或解释成什么?..可以省略吗?
4.In addition to being rich, he's also happy.
上句的being也是当什么词或怎么解释呢?

5.John's being absent gave me a lot of trouble.
上句的being是否由什么简化而来呢?或当什么词解释成什么呢?

麻烦各位了...thanks!