Answer:
1. Voici les crayons.
2. C'est des gommes.
3. Elle aime les livres.
4: C'est des affiches.
5: Voici les cartes.
6: C'est les bureaux de Mme Gudde.
7: J'aime les hamburgers.
8: Tu aimes les sandwichs?
Step-by-step explanation:
In singular form, when a word has '"la/le" as determinant, it becomes "les" in plural form. If it's "une/un", then it becomes "des". You then have to add an "x" or "s" at the end of the noun, depending on the word. Don't forget to change the adjectives too.
BUT, some words in french don't change whether they're written in plural or singular form so you have to be careful with that.
hope this helped :)