Why do we say, for example:
Zustimmung und Ablehnung ist sehr wichtig.
Shouldn't we use sind because this is plural?
This has been confusing me because a teacher said it on a Youtube video.
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Both sentences are possible.
Zustimmung und Ablehnung ist sehr wichtig
Zustimmung und Ablehnung sind sehr wichtig
In the first sentence, "Zustimmung and Ablehnung" are regarded as a unit. This is known as 'synesis' in linguistics.
In the second sentence, they are viewed separately.