====== Past Perfect vs. Past Simple ======

<color brown>**Вопрос**:</color>

Какая смысловая разница между:

1. As soon as I **entered** the room I saw her sweeping the floor.\\
2. As soon as I **had entered** the room I saw her sweeping the floor.\\

3. I knew it that as soon as I **entered** the room I would see her sweeping the floor.\\
4. I knew it that as soon as I **had entered** the room I would see her sweeping the floor.\\
?

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~~DISCUSSION~~