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  1. In your last message, you have said to ask you questions about your sentences, if I failed to understand these.
  2. In your last message, you have said to ask you questions about your sentences, if I failed to understand them.

In second sentence them has been used instead of these. Use of which one is better and why? I know that them is used both for men and women, while these is used for materials or non-human matters. So why second one is better than first?

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First off, delete the second comma; it's unnecessary.

Them as a pronoun is used all the time to refer to plural inanimate objects:

My mom threw all my comic books away when I turned forty, but I still wanted to keep them.

So them substitutes for a previously mentioned plural noun (sentences, comic books) without adding any stress.

These is often used to distinguish one group of objects (animate or not) from a different group.

I can understand the sentences you wrote yesterday but not these you wrote today.

This is why in your sentence, them works better than these.

In your last message, you have said to ask you questions about your sentences if I failed to understand them.

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