Notice that, parce que, car, comme, and even ce n’est pas parce que are all expressions used to express some version of “because.” However, each of these expressions has different rules about where they can be placed in the sentence and whether they can be used to answer Pourquoi ?(Why?):
Can begin a sentence:
parce que ✅
car ❌
comme ✅
ce n’est pas parce que ✅
Can answer the question Pourquoi…?:
parce que ✅
car ❌
comme ❌
ce n’est pas parce que ❌