Sneha2021
KarishmaB GMATNinjaCan you please help me understand the sentence structure?
I am confused with the usage of "to which". Can you share few example to explain usage of "to which", "on/by/in which".
Is it "to which" similar to "which" or other pronoun?
Cajuns speak a dialect brought to southern Louisiana by the 4,000 Acadians who migrated there in 1755; their language is basically seventeenth-century French to which has been added English, Spanish, and Italian words.
Thank you

Relative clauses can have prepositions. The relative pronoun is the object of that preposition in that case.
The prepositions are required. When the object of the preposition is a relative pronoun, the preposition will come before the pronoun.
Consider the two sentences:
Their language is basically seventeenth-century French. English, Spanish and Italian words were added
to this French.
Now, if we want to write it as one sentence with a relative clause, we say
Their language is basically seventeenth-century French to which ('which' stands for '17th century French') English, Spanish and Italian words were added.
The preposition 'to' comes before 'which'
Other examples:
It is the school to which I belong.
The boy with whom he is talking is my brother.