uses of "to"
How can I explain to a Spanish speaker the rule on why this is wrong "Maria beats to her child".
2 Answers
I took your question to be about how we write the phrase in Spanish ie the 'personal a' which many Spanish people instinctively use in English. Many things in the two languages are the same, but in English the 'personal a' is not used. I assume you are learning Spanish and can explain the number of times you forget to use the personal 'a' when using Spanish and tell him/her they must forget to use it when speaking English.
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Do you mean, "How can I explain why it's wrong for Maria to beat her child?" Here's how to say that:
It is wrong to severely punish children by beating them. It causes the child to fear you.
Es incorrecto castigar severamente a los niños golpeándoles. Causa al niño que le temen.
This may not be a perfectly accurate translation, but I think it's close.