Try word reference.com it gives good translations
"In that case" can be translated to French as "dans ce cas."
To say "what is in your pencil case" in French, you would say "Qu'y a-t-il dans ta trousse ?"
trousse
grippe ! for this case we say "grippe porcine"
I am assuming you want to say "Yes, I am speaking French" in French. In that case, it would be: Oui, je parle français.
votre trousse à crayons
une noir trousse
A pencil case is 'une trousse', then the plural is 'des trousses'.
les escaliers, la cage d'escalier
kind - gentil (or in the case of a woman who is kind - gentille)
in my pencil case, I don't have ... -> dans ma trousse, il n'y a pas ... it translates back to: in my pencil case, there is no ...
'ouvrez votre trousse'