PASO 1Elige la opción correcta
PASO 2Agrega los ejercicios que te gustan a Favoritas
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.
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.
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.
Only use which as a relative pronoun for animals or things. The right pronoun to use for people is who (whose, whom).