这是个句型吗,形容词加of结构 the way 有时候要加that不加that怎么区分,

第一句的句型为：It be +形容词+for/of+sb+to do something
it 在句中充当的是形式主语,真正的主语是后面的to do something
整个句子还原则为：To contribute such a large sum was generous of her .
第二个句子,从"that"开始一直到句末为定语从句,修饰the way
第三个句子,从"parents"开始到句末同样为定语从句,修饰way
一般情况下,that可加可不加,但当that在句中充当成分时,则一定不能省
掉而且只能用that：
当先行词是anything,everything,nothing (something 除外),few,all,none,little,some等代词时,或者是由every,any,all,some,no,little,few,much,each等修饰时
(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.

It is +形容词+ of sb表人的某种性格
that加不加要看在句中充不充当某种成分，如果充当某种成分就需要加。另外还需要注意一些结构如so/such,强调句型等

逐句分析。
It was generous of her to contribute such a large sum.
这句IT做形式主语，to contribute不定式才是真正的主语，句中of her 可以省略（需要强调做动作的人时才需要）
另外，IT'S +ADJ.+OF/FOR 可以作固定句式来记忆。
they quickly learn the way ...

I don'know