what how從句的區別和用法

例句：

How do you spell "potato?"

“”怎麼拼寫？

How old is this building?

這座建築已有多少年了？

Describe how you did it.

談談你是怎樣做這事的.。

What does "evidence" mean?

是什麼意思？

Did you see what happened?

你看見出什麼事了嗎？

What bloody awful weather!

多麼糟糕透頂的天氣！