Which of these sentences is correct?
The accent with which I speak
The accent which I speak with
Are they not the same?
While we are on the topic, I would greatly appreciate if you would tell me which one of the following sentences is correct and if the wrong one is not said at all.
They are a very proud people
They are very proud peopleCancer cells help invade
Cancer cells help to invadeOxygen has a higher electronegativity
Oxygen has higher electronegativity