Using le or l' to refer to previously mentioned ideas (direct object pronoun)

When the same idea is talked about more than once, it's usually replaced with a pronoun the second time in both English and French.
We use it / that in English, and in French we use le or l'.

Tu veux venir à la piscine? - Oui, je le veux.Do you want to come to the swimming pool? - Yes, I want to / I'd like that.

Tu penses qu'il est bon pour elle ? - Non je ne le pense pas.Do you think he's good for her? - No, I don't think so.

Note that le and l' replace ideas introduced mostly by que, or starting by an infinitive.

ATTENTION: You always use the masculine singular form le or l'even if the idea contains a feminine noun, as it's the whole idea that is considered here.

Note also that while in English, the pronouns it or that are not always necessary (e.g. Yes, I want to.), they are always required in French. 

Vous croyez que Pierre viendra au bal? - Oui, nous le croyons.Do you think that Pierre will come to the ball? - Yes, we believe so.

Pauline pense vraiment que c'est bien de faire des études? - Oui, Pauline le pense vraiment.Pauline really thinks that it's good to study? -Yes, Pauline really thinks so.
 

ATTENTION: When ideas are introduced by the preposition à, then you use the adverbial pronoun y!

See also  Y can replace à + thing / object / location (adverbial pronoun)

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Examples and resources

Vous croyez que Pierre viendra au bal? - Oui, nous le croyons.Do you think that Pierre will come to the ball? - Yes, we believe so.
Tu penses qu'il est bon pour elle ? - Non je ne le pense pas.Do you think he's good for her? - No, I don't think so.
Pauline pense vraiment que c'est bien de faire des études? - Oui, Pauline le pense vraiment.Pauline really thinks that it's good to study? -Yes, Pauline really thinks so.
Tu veux venir à la piscine? - Oui, je le veux.Do you want to come to the swimming pool? - Yes, I want to / I'd like that.
I'll be right with you...