What is the usage of the 'could have been' here? What's the tense here? The tense is past (of 'could be').
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LDaueach of these common occurrences could have been inconceivable at the turn of the 19th century.What is the usage of the 'could have been' here? What's the tense here?The tense is past (of 'could be'). However, the grammar of the sentence is not correct; 'could' should be replaced by 'would'.