Past Perfect - Spot the mistake | Baamboozle - Baamboozle

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By the time I arrived at the meeting, everyone already started discussing the budget.

By the time I arrived at the meeting, everyone had already started discussing the budget.

While I was looking for my phone, I realised I had left it in the taxi.

Correct.

While I presented my report, I noticed that I forgot to include a crucial detail.

While I was presenting my report, I noticed that I had forgotten to include a crucial detail.

When I woke up, I discovered that I set my alarm for the wrong time.

When I woke up, I discovered that I had set my alarm for the wrong time.

I finished all my work before I had gone to bed.

I had finished all my work before I went to bed.