The verb devoir in all its many forms and meanings: as a verb in its own right, but especially as a semi-auxiliary, in which capacity it performs an astonishing number of functions.
A table showing what a French past tense can be in English and what an English past tense can be in French.
On the great divide between the perfective (passé composé, passé simple) and the imperfective (imparfait) in French.
The signature song (from 1969) of Joe Dassin. One of the positive remote effects of Hollywood blacklisting.