Bonjour
1- <em>Tous les samedis matin, ils choisissent le parc.</em>
a- Tous les samedis <u>matin</u>, is correct. "matin" has to stay singular. Used this way, it's an adverb so it doesn't agree.
BUT the other half of the sentence =>. "ils ont choisi le parc" is incorrect
b- ils choisissaient le parc. is correct
<em>Just check, if matin is singular for the b)..; it's the best answer</em>
<em>-</em>
2- <em>Nous mangeons en ville le samedi.</em>
<em> </em>b- Nous allons manger en ville le samedi.
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3- <em>Il va me téléphoner ce soir ?</em>
b-<em> </em>Oui, il va te téléphoner.
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<em>sorry for the number 1, it's confusing... if you have any question, please ask in comment..</em>
hope this helps ☺☺☺
Bonjour
Tu aimes sa casquette bleue
<em>Casquette is a feminine noun => </em><em>une casquette</em>
<em>sa</em><em> is the feminine possessive adjective</em>
<em>so the adjective agrees with the noun => sa casquette </em><em>bleue</em>
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hope this helps ☺☺☺
Answer:
Colocataire necessaire!
Je cherche un compagnon de chambre qui est gentil et drole et qui va aide aux taches menageres volontiers.
Note:
I used a translation app because I am not yet fluent so I hope it was right and that this helps.