I know of a few idioms
<em>Boire comme un poisson</em>= To drink like a fish
Example: Mark a bu comme un poisson > Mark drank like a fish
This idiom mean when someone is drinking (alcohol) they drink a LOT of it, like a fish would when they are in the water.
<u><em>(Boire comme un trou, is another way to put it)</em></u>
<em>Ne rien savoir faire de ses dix doigts</em> = Do not know anything about your ten fingers
This idioms is basically how you call someone useless, they don't know anything.
<em>{I haven't done french in almost seven years, but I remember these two from a movie I watched when I was young, I hope this kinda helps!}</em>
Tout simplement que tu dois travailler avec ton voisin.
Travaille est à l'impératif.
Le mode impératif est utilisé pour donner un ordre, un conseil, une recommandation.