A copula is “That part of a proposition which connects the subject and predicate; the present tense of the verb to be (with or without a negative) employed as a mere sign of predication.” It uses a linking verb to describe the subject, so is always either another noun or an adjective. Other verbs ...

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Required to repeat 'is' when specifying two attributions?

I am seeing that I often leave out copula when connecting two clauses. Like: A notation is fixed but the performance variable. I have the feeling this is a mistake coming from my German mother ...