Aprende el inglés auténtico de libros y películas.

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It's better to enjoy yourself when you're young rather than wasting time worrying about the future.
It's better to enjoy yourself when you're young than to waste time worrying about the future.

Don't mix one form of the verb with another. If the first verb in a comparison is in the infinitive, the second must also be in the infinitive.

Which of the two boys is the taller?
Who of the two boys is the taller?

Use the interrogative pronoun which? for both people and things, when it asks for one out of a definite number.

The interrogative pronoun what? doesn't imply choice: What's your telephone number? It's also used to ask for a person's profession. What's your father? - He's a lawyer.

A friend of his told us the news.
A friend of him told us the news,

We use the double genitive (of + name + 's, his, mine etc) when we want to emphasise the person who possesses rather than the thing which he possesses. A friend of his is simply another way of saying one of his friends.

I've a brother who is at school.
I've a brother which is at school.

Only use which as a relative pronoun for animals or things. The right pronoun to use for people is who (whose, whom).

It's the best which I've seen.
It's the best that I've seen.

Use the relative that (not who, whom, or which) after a superlative. It can, however, be omitted.

Tema superado!

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