第一句的句型為：It be +形容詞+for/of+sb+to do something
it 在句中充當(dāng)?shù)氖切问街髡Z(yǔ),真正的主語(yǔ)是后面的to do something
整個(gè)句子還原則為：To contribute such a large sum was generous of her .
第二個(gè)句子,從"that"開(kāi)始一直到句末為定語(yǔ)從句,修飾the way
第三個(gè)句子,從"parents"開(kāi)始到句末同樣為定語(yǔ)從句,修飾way
一般情況下,that可加可不加,但當(dāng)that在句中充當(dāng)成分時(shí),則一定不能省
掉而且只能用that：
當(dāng)先行詞是anything,everything,nothing (something 除外),few,all,none,little,some等代詞時(shí),或者是由every,any,all,some,no,little,few,much,each等修飾時(shí)
(1) Have you taken down everything (that) Mr.Li has said?
(2) There seems to be nothing (that) seems impossible for him in the world.
(3) All that can be done has been done.
(4) There is little (that) I can do for you.