你的句子中的 so（所以）都是连词，而不是副词。so 既可用作连词也可用作副词，但它们的意思不一样：

▲用作副词的基本意思

1. 如此，这么

Don’t go so fast. 别走那么快。

I ate so much food that I was almost sick. 我吃了那么多的食物。几乎要吐了。

2. 非常

You are so kind. 你真是太好了。

I’m so happy. 我非常高兴。

3. 同样，也是

I was late and so was she. 我迟到了，她也是。

“I am leaving now.” “So am I.” “我现在要走了。”“我也要走了。”

4. (用于指代前面说过的话)如此，如是

“Is she coming?” “I think so.” “她会来吗?”“我想会来。”

Martin wants to write, but he’s afraid to say so. 马丁想写作，但害怕这样说。

Are you free this evening? If so, let’s go out for a meal. 今晚你有空吗? 如有空，我们到外边去吃饭。

▲用作连词的基本意思

1. 因此，所以

I was tired, so I went to bed earlier. 我累了所以早点睡了。

He took my shoes, so I couldn’t leave the house. 他把我的鞋拿走了，所以我出不了门。

2. 为的是，以便

I pocked him a little food so (that) he would not get hungry. 我包了一点食物给他，以免他挨饿。