问一下关于英语从句的问题

There are a number of reasons that mean 意思：有许多理由意味着.that mean 等于which mean,是定语从句,修饰a number of reasons . mean 是定语从句里面的谓语动词,动词后面是由that引导的宾语从句recycling is not done as effectively as it could,意思是：有许多理由说到循环利用不是能象自身一样有效地完成.
the primary problem being the attitude of the general public,意思是：主要的问题出自公众的态度.这是现在分词的独立结构,做原因状语.独立结构只能用现在分词,如果分词有主语,也可以加上.独立结构一般用于简单句,它可改为复合句.例如：
1. He being there , I wont go. (他在的话,我就不去了.）,其实这句子可改为复合句：If he is there, I won't go.
2. The chair being broken, I cant sit on it. (椅子坏了,我不能坐上去）,其实这句子可改为复合句：Since the chaire is broken ,I cant sit on it.
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