The verb "to be" is a linking verb as it is used to link an adjective with a noun. It is another way to describe a noun, rather than placing the adjective before the noun. " Sometimes, it is better style to introduce a new idea with a clause like in (2) because it makes it easier for the reader to follow.
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BillJI suppose it's just that English isn't a perfect piece of work.Go and wash your mouth out with soap!