Combien de chiens est-ce qu’elle a ?
Combien de chiens est-ce que Lætitia a ?
Inversion:
Combien de chiens a-t-elle ?
Combien de chiens a Lætitia ?
You just place them in the beginning, along with what you want to know the quantity of, in this case ‘Dogs’.
Note: the euphonic ‘t’ fixes the vowel hiatus.
Note: It’s NOT des chiens, because many times ‘de’ is not followed by an article (The, a, etc) in combien, beaucoup, etc. (http://forum.wordreference.com/threads/fr-combien-de-des-repas.460622/)
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