Time and convenience (is/are) turning friends and acquaintances away from our doors.
Which is better in this context, 'is' or 'are'? Can the answer to this question be 'is' based on notional agreement?
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I have not encountered in difference in is and are except for is being singular noun/s and are being for plural noun/s. And if there is some difference I don't know about, that would mean that there is a confliction/paradox between the usage of is and are.
The nouns combine to form like a plural combined noun.