Question

She had done some rescarth before she wrote about the traditional craft of the region (after)

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We can"t go. We have to wait for them to arrive (until)

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Answer 1

She had done some rescarth before she wrote about the traditional craft of the region (after)

=> she wrote about the traditional craft of the region after She had done some rescarth

We can"t go. We have to wait for them to arrive (until)

=> We have to wait for them until they come