Why is "which" being used here? Can I use "how" instead?
Native speaker’s answer
Rebecca
The pronoun "which" used here makes up the phrase "to which", which in this context is a more formal way of expressing "how much". So you could replace "the extent to which" in this sentence with "how much". Ex: The bill shows the amount to which you owe. Ex: What is the extent to which that you think about politics?