"He drinks milk."
Translation:Él bebe leche.
You use bebe when you use usted and bebes with tu. The difference between tu and usted is tu is more slang and u would only use that with friends and family and usted is more respectful and you would use when talking to a judge or ur boss and if you and your boss become friends you can use "tú" but usted is just more professional and respectful but means the same thing hope I helped
It depends on what sentence you are to translate. Sometimes it's a specified milk, in such a case you say "la leche/la manzana". If there's no article, it means the sentence doesn't mention any certain milk.
If the sentence was "He drinks the milk" you would have to use "la leche". Hope it's clear for you now, cheers!