French language Q&A Forum

As it is the girl who says that she is sure, shouldn't it be "Je suis sûre que ... " instead of "Je suis sûr que ... ? 

Also, is "Ce n'est pas grave" (with silent "ne") an accepted alternative for "C'est pas grave" in writing dictation? (I often can't hear all the little words in spoken French but still try to include them in my written responses)