Les Conjonctions
Conjunctions provide a link between similar words or groups of words, such as nouns, verbs, people, etc
Coordinating conjunctions join words and groups of words with an equal value.
Subordinating conjunctions join dependent clauses to main clauses

pourvu que (provided that)

à moins que (unless)

bien que (although)

use of prepositions with place-names
contractions with a and de with la and les

à (at)
de (of)
en (in)

avant and arrière are prepositions and therefore do not agree with nouns
droit and gauche are regular adjectives that do agree

Moi Mots
Elements of Grammar