Look at these sentences using the preposition dont:

J'ai acheté deux manteaux, dont un pour l'hiver.I bought two coats, including one for the winter./ one of which is for winter.

Il y a 45 vaches dans cette ferme, dont dix blanches.There are 45 cows on that farm, including ten white ones. / ten of which are white.

Annie aime les romans de Jane Austen, dont Orgueil et Préjugés et Emma.Annie likes Jane Austen's novels, including Pride and Prejudice and Emma.
 

The preposition dont can be used to express including.


How to form X of which + [verb] ?

J'ai trois enfants, dont deux qui sont au collège.I have three children, including two (that) / two of whom are in secondary school.

Marie possède cinq tableaux, dont deux qu'elle a achetés aux puces.Marie owns five paintings, including two (that) / two of which she bought at the flea market.

Le chanteur a interprété trois chansons, dont une qu'il avait écrit spécialement pour l'occasion.The singer sang three songs, including one (that) / one of which he had written especially for the occasion.

J'ai trois cousines, dont une qui habite aux États-Unis.I have three cousins, including one who lives in the US.

If including / [number] of which is followed by a conjugated verb, in French you need to add a relative pronoun (qui or que / qu') in front of the verb.

 

To know whether to use qui or que, have a look at the following lessons:
Qui = Who, which, that (relative pronouns) 
Que = Whom, which, that (relative pronouns)

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Examples and resources

J'ai trois enfants, dont deux qui sont au collège.I have three children, including two (that) / two of whom are in secondary school.
J'ai acheté deux manteaux, dont un pour l'hiver.I bought two coats, including one for the winter./ one of which is for winter.
Il y a 45 vaches dans cette ferme, dont dix blanches.There are 45 cows on that farm, including ten white ones. / ten of which are white.
Le chanteur a interprété trois chansons, dont une qu'il avait écrit spécialement pour l'occasion.The singer sang three songs, including one (that) / one of which he had written especially for the occasion.
J'ai trois cousines, dont une qui habite aux États-Unis.I have three cousins, including one who lives in the US.
Marie possède cinq tableaux, dont deux qu'elle a achetés aux puces.Marie owns five paintings, including two (that) / two of which she bought at the flea market.
Pour ce soir, nous avons sélectionné des films d'horreur, dont Les Griffes de la Nuit et Vendredi 13.For tonight, we selected horror movies, including Nightmare on Elm Street and Friday 13th.
Nous avons trois chiens, dont deux labradors.We have three dogs, including two Labradors. / two of which are Labradors.
Annie aime les romans de Jane Austen, dont Orgueil et Préjugés et Emma.Annie likes Jane Austen's novels, including Pride and Prejudice and Emma.
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