The confusion between 'lend' and 'borrow' is that both mean prestar. So, which one to use? Simple, if prestar is being received by the subject, it is 'borrow' and if prestar is being performed by the subject, then it is 'lend'.
Can I borrow your pen? → 'I' (subject) receives prestar.
¿Puedo yo usar tu lápiz?
You have borrowed many DVDs. → 'You' (subject) receives prestar.
Tu tienes muchos DVD prestados.
I will lend you the books. → 'I' (subject) performs prestar.
Te prestaré los libros.
Can Enzo lend her his phone? → 'Enzo' (subject) performs prestar.


