Dear �Normandey:
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My thinking is similar to that of Bruce and Shallottslady. I agree that �in ancient time � is not a commonly used expression.
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You ask for sources.
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The British National Corpus give NO INSTANCE of �in ancient time � ever being used.
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They give 35 examples of� sentences which include �in ancient times �.
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These�include, of course:
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"And did those feet in ancient times walk upon England �s mountains green?"
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There are only 2 examples, where the phrase following �in ancient times �, uses the Perfect Tense.
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"The possibility of transatlantic cultural links in ancient times, has been re-opened by an American expedition, which claims ... ."��� PRESENT PERFECT TENSE
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"In ancient times�the manor had belonged to the Martyns ... ." PAST PERFECT TENSE
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The remainder of the examples use either the Past Simple Tense, or one of the Modal Auxiliary Verbs.
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There are 12 examples of the use of �since ancient�times � = 9 uses of the PRESENT PERFECT TENSE and 3 uses of the PRESENT SIMPLE TENSE.�
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Bruce and Shallottslady have both�made�very valuable contributions.�
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I hope that this contribution helps,�too.
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Les Douglas