My sons sentences in the titles order.
1. Is that a giant in the woods?
2. I like the way French people talk.
3. That house is made of gold!
Where is the adjective in the first sentence? Does he understand what a demonstrative adjective is?
There is no common adjective in the third sentence.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.