請問幾個文法..

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1. We think the proposed twenty-percent increase is a bit too high.
proposed是當動詞?

是pp

2.We could consider offering a bigger selection as along as..
=>為啥offering要加ing?..

是動名詞

不能用could consider that offer a bigger selection嗎?

主詞在哪？

3.I was expecting you to offer a discount.
=>這裡的was改成am可以?

你說話不用分出過去現在？
　
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[天之痕]

1. We think the proposed twenty-percent increase is a bit too high.
=>看不太懂此句子的結構..proposed是當動詞? think後面又接動詞?

We think (the proposed twenty-percent increase) is a bit too high.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
名詞片語->主詞

2.We could consider offering a bigger selection as along as..
=>為啥offering要加ing?..不能用could consider that offer a bigger selection嗎?

當然不能用could consider that offer a bigger selection.....因為that子句沒有主詞

We could consider offering a bigger selection as along as..
= We could consider that we offer a bigger selection as along as..
= We could consider to offer a bigger selection as along as..

3.I was expecting you to offer a discount.
=>這裡的was改成am可以?

本句通常是結完帳後說的話，"我原本期望你會給我折扣優惠!!"
若用am，則是希望老闆給折扣，不過通常應該不會這樣說
通常會說: Could you give/offer me a discount? 之類比較婉轉的語氣
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