Present time

Anne: If John is cursing, it means that he is very angry
Anne said that if John is cursing, it means that he is very angry. it is still true

Anne said that if John was cursing, it meant that he was very angry. (referring to a past habit

Past time

.Jenny: If I got home late, my mom scolded me
Jenny recalled that if she got home late, her mother had scolded her

Note that past tenses in the if-clause do not normally change. In the main clause they may change to the past perfect simple or continuous

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