- Je me demande si Freddie est encore vivant
  I wonder whether F... is still alive  (still with us)

- Comment le savoir ?
   There's no way of knowing

- Si mon père était là ... C'était par lui que j'avais des nouvelles de ma famille...
   If my father were still here (still with us).... He was the one (the person) who used to (who would) keep me informed of (keep me up to date with)  the family.

Malheureusement...
Unfortunately..

Je sortis de ma poche la photo de Gay Orlow et du vieux Giorgiadzé et lui désignant
I'homme brun qui me ressemblait :
I took out (I produced) a photo from my pocket of G.. O.. and old G..  and showing him (pointing at) the dark-haired man who looked like me, I said:

- Vous ne connaissez pas ce type ?
  Do you happen to know this chap?

- Non.
   No (No I don't)

- Vous ne trouvez pas qu'il me ressemble ?
  Don't you think he looks like me (we look alike)

Il se pencha sur la photo.
He leant over (he took a close look at) the photo

- Peut-être, dit-il sans conviction
  Maybe (Perhaps) (I suppose so) (You could say that) he said unconvinced (half heartedly)

Patrick Modiano
Rue des boutiques obscures