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They never received an invitation to the concert, so naturally, they could not attend it. |
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Apparently, they didn't attend the concert because they were only invited to it at the last minute. |
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They were sorry not to attend the concert, but the invitation came too late. |
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If the invitation had reached them a day or two earlier, they might have attended the concert. |
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If they had known beforehand that there was going to be a concert, they would certainly have attended. |