8.94 referring to things

When you are referring to a thing or group of things, you use 'which' or 'that' as the subject or object of a non-defining clause.

• The treatment, which is being tried by researchers at four hospitals, has helped patients who have failed to respond to other remedies.
• British Rail, which has launched an enquiry, said one coach was badly damaged.
• He was a man of considerable inherited wealth, which he ultimately spent on his experiments.
• ...this offer, which few can resist.