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Спасибо, Wowik. Сейчас ясно.

I got the sentence from the Big Silver Book of 555 Verbs on the verb "мочь".

Вы сможете помочь сыну по физике7
Перевод:
1. Can you help your son with physics? or
2. Can you help my son with physics?

Would the use of "свой" или "твой" make it easier to understand?...