je suis sûr d'(avoir raison) : I'm sure that (I'm right)être, présent
The être sûr de construction can be followed by a verb in its infinitive form or by a noun.
Je suis sûr de rater mon examen I'm sure to fail my exam.
Je suis sûr de quelque chose I'm sure of something.
être sûr que (tu as raison) : to be sure that (you are right, correct)
The être sûr que construction is followed a person pronoun (je, tu, ils, etc.) and a conjugated verb.

Je suis sûr qu'elle va venir I'm sure she's going to come.


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