xercice : Ajoute for ou since devant chacune des expressions suivantes. (retour)

 

since	January 1st	since	yesterday	for	3 seconds	since	last night
for	half an hour	since	the beginning of the year	since	they were born	for	a year
since	the last holidays	for	two centuries	since	the Middle Ages	since	I arrived
for	a week	since	half past two	for	a long time	for	ten years