I am not sure whether for replacing nouns that describe things in sentences it is correct to use "them" or "these". On TV I heard both versions. Are they both correct? Here are examples:
1. I want to buy (borrow, find etc.) them (books, t-shirts, chairs etc.).
2. I want to buy (borrow, find etc.) these (books, t-shirts, chairs etc.).
You will hear the incorrect version from natives, but it is considered uneducated.
And how about "they"? I also heard a few times that it was used instead of nouns that ment things. Is it allowed?
The cars were parked in front of school. After explosion they were all destroyed.
Yes — that's fine.
(...in front of the school. ...after the explosion...)
1. I want to buy (borrow, find etc.) them.
2. I want to buy (borrow, find etc.) these.
These two are fine if it's clear what the speaker is referring to (books, t-shirts, chairs etc). In the second, it is likely that the speaker is pointing to the objects, or holding them up.
In the situation when for example my girl asks me "Where are my shoes?" answer "I haven't seen these." doesn't sound good to me (to me or for me?). So is the statement "I haven't seen them. " correct in this case?