How do you use à and de with lequel in french?

Question

I know that lequel is a french pronoun meaning which, but I am confused on WHEN you are supposed to conjoin it with either À or DE?

also how does adding à or de change the meaning of lequel?

Thanks!

Answer 1

Lequel means which, à, de, dans are used to refine the meaning: about which, which, in which....



A + lequel: about which / Which one (interrogative form).

You use it when the verb ends with an à. Penser à, etc.



De + lequel: of.

You use it when the word relating to the object has a de in French. Je suis tombé près DE l'arbre => l'arbre auprès duquel je suis tombé. (the tree near which I fell)



Here is a very good explanation of it. He tackles the auquel, duquel around the 3rd minute but you should listen to the whole of it as he gives a good overview of the whole thing.

http://www.youtube.com/watch?v=XP-t4Lr820w

Answer 2

I'm not sur to understand your question but :

à lequel -> auquel

à lesquels -> auxquels

à laquelle -> à laquelle

de lequel -> duquelle

des lequel -> desquels

de laquelle -> de laquelle

It all mean which in english but it changes form to agree with the subject or with a noun etc...