Silent final consonants
Final -s, -t, -d, -x and -p are usually silent: 'petit' ends on the vowel, 'trois' has no s sound.
Liaison
That silent consonant reappears before a vowel. 'Les amis' sounds like lay-zami. Liaison is what makes fluent French sound joined up.
Nasal vowels and the French r
In -on, -an, -in the n is not pronounced; the vowel is sent through the nose. The r is made at the back of the throat, closer to a soft gargle than an English r.

