I'm studying relative clauses now and I've got a couple of questions.
1. When a relative clause gives extra information we have to use the relative words (when the relative words are objects).
Is the rule breakable in spoken English or not?
2. Can we change -ing and -ed clauses into which, who...etc. clauses?
The road connecting the two villages is very narrow.
The road which connects the two villages is very narrow.
If both sentences are OK is there any difference in meaning (may be very slight)?
Thank you in advance!