Approximation
This is an advanced English grammar lesson about approximation. It explains how to use approximate language in spoken and informal written English when exact details are not important or known. It covers using words like 'some', 'around', 'about', 'roughly', and 'approximately' with numbers. It also details using '-odd', phrases for large amounts, and phrases indicating amounts over/under. The lesson further explains using 'kind of' and the suffix '-ish' with adjectives to make them less exact. Finally, it covers using 'stuff' and 'thing(s)' as vague words for substances, materials, or groups of objects.