• I didn't like the book. The story was so stupid.
• I like Liz and Joe. They are so nice.

• I didn't like the book. It was such a stupid story. (not a so stupid story)
• I like Liz and Joe. They are such nice people. (not so nice people)

We say such a ... (not a such): such a big dog (not a such big dog)

• It's a beautiful day, isn't it? It's so warm. (= really warm)
• It's difficult to understand him because he talks so quietly.

• It was a great holiday. We had such a good time. (= a really good time)
• You always think good things are going to happen. You're such an optimist.

• The book was so good that I couldn't put it down.
• I was so tired that I fell asleep in the armchair.

• It was such a good book that I couldn't put it down.
• It was such nice weather that we spent the whole day on the beach.

• I was so tired I fell asleep.

• It was such nice weather we spent ...

• Somebody told me the house was built 100 years ago. I didn't realise it was so old. (= as old as it is)
• I'm tired because I got up at six. I don't usually get up so early.
• I expected the weather to be cooler. I'm surprised it is so warm.

• I didn't realise it was such an old house.
• You know it's not true. How can you say such a thing?

• You won't find the word 'blid' in the dictionary. There's no such word. (= this word does not exist)