关于动词不定式的用法Withsomanythingstobuyformysister'sbirthdayparty,Imadeashoppinglistbeforegoingtotheshop.为什么用tobuy而不用tobebrought?(相似的还有themorningairissogoodtobreathe.为什么不是to

Question

关于动词不定式的用法
With so many things to buy for my sister's birthday party,I made a shopping list before going to the shop.
为什么用to buy而不用 to be brought?
(相似的还有the morning air is so good to breathe.为什么不是to be breathed?)
To learn English well,we should find opportunities to hear English spoken as much as we can.为什么是spoken而不是speaking
Some people don't like to be praised to their face.为什么不是being praised?
I really don't remember ever seeing him anywhere.为什么是seeing而不是seen或其他

Answer 1

to buy 做things的定语,意为：要买的；to breath 做状语,意为：呼吸起来
spoken 与 English 有被动关系,有它来做定语
不是经常发生的情况,用to do
remember seeing 表示看到的动作已经过去,to see 则表示动作未发生
没有被动关系不能用seen