so much和very much意思差不多，但前者用在感叹句末尾，后者用于陈述句末尾。very的意思是很，非常；very一般是陈述事实；so的意思是如此，so更强调情感上；very修饰形容词和副词的原级和作形容词用的现在分词；so是副词，修饰形容词或其它副词。

例句

I must say that I am very much to blame.

我必须说都怪我不好。

The shampoo lathers so much it's very hard to rinse it all out.

这种洗发水泡沫太多，很难冲干净。

Advance in the jungle was very slow.

在丛林中行进很慢。

He used to like the blues very much.

他过去非常喜爱布鲁斯乐曲。

His farewell speech was very touching.

他的告别演讲非常感人。