French language Q&A Forum

In the example:  "Nous avons fait mal à nos amis."

Does à never change to aux?

"Adverbs of place and certain adverbs of time usually FOLLOW the past participle: 

e.g. tard, tôt,... and some adverbs ending in -ment

Il est parti tard."

But the "correct"micro-quiz answer for the placement of "plus tard" is at the beginning or end of the sentence. Does adding "plus" modify the normal placement of "tard"?