Knowing the simple glue-words like demonstratives, pronouns and interrogatives means I can get the gist of it in a way I couldn't before. In a strange way looking at these languages feels like looking like the close relatives of my native Swedish does (i.e. Norwegian and Danish). It's different, but in many cases I have so many of the basic pieces the rest can be inferred from context with reasonable accuracy.
Army: Danish hær, Norwegian hær, Swedish armé, French armée
Ice-cream: Danish is, Norwegian is, Swedish glass, French glace
Arm-chair: Danish lænestol, Norwegian lenestol, Swedish fåtölj, French fauteuil
Window: Danish vindue, Norwegian vindu, Swedish fönster, French fenêtre
(of course, a bunch of French also made its way into Danish and Norwegian as well. And the pronunciation is not always obvious either with French loanwords. I shocked my partner once while waiting at Postnord by saying out loud “Säger man kön (hard k) eller kön (soft k)?”)
Or the spelling. I mean, I know how the letters are pronounced, so I can see that fåtölj is actually a good transcription, but visually it bears no resemblance whatsoever with fauteuil.
I have found that French words that ended up in English were actually quite difficult to recognise in a conversation, even though they are written exactly as in French most of the time.
I guess it’s related to the great vowel shift (but not only, even consonants are weird), but English really is weird compared to a lot of continental European languages. For example, a /r/ sounds like a /r/ in anything from Spanish to Finnish. Granted, there are differences in prononciation, but it is still not distorted beyond recognition. Nothing that comes close to the utterly bizarre prononciation of the /r/ in /iron/.
Compare English "iron" https://en.wiktionary.org/wiki/File:en-us-iron.ogg
German "eiern" https://en.wiktionary.org/wiki/File:De-eiern.ogg
French "ailler" https://en.wiktionary.org/wiki/File:LL-Q150_(fra)-Lepticed7-...
None of the <r>s is anything like [r].
Then again several of the more obviously "french" words are drifting the other way as people assume they should be pronounced like modern french - valet is a great example here where most english people now drop the final 't'