it is +adj + that +从句 等于什么

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it is +adj + that +从句 等于什么

it is +adj + that +从句 等于什么
it is +adj + that +从句 等于什么

it is +adj + that +从句 等于什么
it is +adj + for sb to do sth.
it is necessary that we learn english.
it is necessary for us to learn english.

it is + adj + that + 从句 = That 从句 is adj.
比如it is necessary that we learn english.=That we learn english is necessary.
在这个从句中that从句做主语,典型的名词性从句做主语,that是个conj.

等于it is +adj+for sb to do sth