Thank you for your last correction.

Can you explain to me why I can't use the past simple in sentence (1) as the action is finished? I really hope you can check all the other sentences too

1) He makes clear that he had to overcome his prejudice towards her ..... (he is unprejudices now)
2) He is not remorseful. He doesn't repent his attitude towards Elizabeth's sister
3) He says that she might have forgiven him, if her pride hadn't been hurt by his honest confession.
4) She accuses him of loving him against his reason.

Thank you

If you are writing in the present, then all verbs must be in the present; if writing in the past, then all must be in the past. You can not switch back and forth.

You are saying, "he makes"- present
he had - past.

The other sentences are fine.

Sure! Let's analyze each sentence and explain the use of verb tenses.

1) He makes clear that he had to overcome his prejudice towards her.
In this sentence, the past perfect tense ("had to overcome") is used to describe a past action that occurred before another past action. In this case, the action of "overcoming his prejudice" happened before the action of "making clear." We use the past perfect to show the sequence of events in the past.

2) He is not remorseful. He doesn't repent his attitude towards Elizabeth's sister.
Here, the present simple tense is used to express a general statement about the person's current state or attitude. "He is not remorseful" and "he doesn't repent" both describe his ongoing lack of remorse and repentance.

3) He says that she might have forgiven him if her pride hadn't been hurt by his honest confession.
In this sentence, the past perfect ("hadn't been") is used to indicate that the condition (her pride not being hurt) was not met in the past. This tense is used to talk about hypothetical or unreal situations in the past.

4) She accuses him of loving him against his reason.
In this sentence, there's a mistake with the pronoun usage. Instead of "She accuses him of loving him...", it should be "She accuses him of loving her..." or "She accuses him of loving against his reason."

To summarize, the use of verb tenses in these sentences includes the past perfect tense to express a past event that took place before another past event, the present simple tense to describe a current state or attitude, and the past perfect tense to discuss hypothetical or unreal situations in the past. Additionally, it's important to ensure correct pronoun usage to maintain clarity in the sentence.