1. To clarify the subject of the infinitive:
* When the infinitive is used as a noun:
* *Me gusta comer.* (I like to eat) - The pronoun "me" clarifies that "I" am the one who likes to eat.
* *Te recomiendo ir.* (I recommend you to go) - The pronoun "te" clarifies that you are the one being recommended to go.
* When the infinitive is used as an adjective:
* *Tengo que hacer.* (I have to do it) - The pronoun "que" clarifies that "it" is the thing that needs to be done.
* *Es un libro para leer.* (It is a book to read) - The pronoun "para" clarifies that "it" is the thing that needs to be read.
2. To avoid ambiguity:
* When the infinitive is used as a noun and there is another noun in the sentence that could be mistaken for the subject of the infinitive:
* *Te gusta comer manzanas.* (You like to eat apples) - The pronoun "te" clarifies that "you" are the one who likes to eat, not the apples.
* When there is no other subject for the infinitive in the sentence:
* *Ir a la playa es divertido.* (Going to the beach is fun) - The pronoun "ir" clarifies that "going" is the subject of the infinitive.
3. In certain idiomatic expressions:
* *Darle una vuelta a la cabeza.* (To drive someone crazy)
* *Echarle un vistazo.* (To take a look)
* *Ponérselo fácil.* (To make it easy for someone)
Important notes:
* Direct Object Pronouns: The direct object pronouns (me, te, lo, la, nos, os, los, las) are attached to infinitives using a hyphen (-).
* Indirect Object Pronouns: The indirect object pronouns (me, te, le, nos, os, les) are attached to infinitives without a hyphen.
* Reflexive Pronouns: The reflexive pronouns (me, te, se, nos, os, se) are attached to infinitives using a hyphen.
Examples:
* *Me gusta comer.* (I like to eat)
* *Te recomiendo ir.* (I recommend you to go)
* *Tengo que hacerlo.* (I have to do it)
* *Es un libro para leerlo.* (It is a book to read)
* *Te gusta comer manzanas.* (You like to eat apples)
* *Ir a la playa es divertido.* (Going to the beach is fun)
* *Darle una vuelta a la cabeza.* (To drive someone crazy)
I hope this explanation helps! If you have any more questions, feel free to ask.