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Bonjour,
you must say "je pense que mes résultats SERONT bons". In french you always have to conjugate the verb, that is to say, for a certain tense, there is a different form of the verb depending on the subject. So, for the indicative mode of the present of the verb être, you have:
je suis, tu es, il/elle est, nous sommes, vous êtes, elles/ils sont. And for the future: Je serai, tu seras, il sera, nous serons, vous serez, ils SERONT.
So, as "mes résultats" corresponds to the third person plural (ils), you must say: "mes résultats SONT(present); and, mes résultats SERONT (future).
Right?:)
