英语语法(It adj for sb.to do sth.)Ozone is helpful _____the eart

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英语语法
(It adj for sb.to do sth.)Ozone is helpful _____the earth.答案是to,那么如果按照上面的,为什么不能选for呢?

Ozone is helpful to the earth.
臭氧对地球是有利的.
这里不是It's(你打错了) adj for sb. to do sth.句型
首先,这里没有sb.成分,只有sth.(the earth)
其次这句话的意思是：sth.对.,(sth)...有利.
eg：it's is harmful to your health.它对你有害.
当然有时候to与for可以等价,英语是灵活的,不要学死了.
做题目要根据意思来,然后符合语法就行,
而不是把句子硬往语法框框里面套

"It is+adj.+to+sb.+to do sth." 和 “It is + adj.+for +sb.+to d It is adj 造句 for sb to do sth 造句 find it (is) +adj+for sb.+to do sth. It is+adj for sb to do sth 造句 It is+adj (for sb) to do sth It is + adj + for sb +to do sth It is adj.for sb.to do sth.句子成分 It is adj.for sb.to do sth.和It is adj.of sb.to do sth.改成实际主语 It is +adj+for sb.+to do sth.与 It is +adj +of sb.+to do sth. sb.spends some time doing sth.it is+adj.+for sb.to do sth.it find it adj for sb to do和find it is adj for sb to do sth区别 ①It is + adj + for sb to do sth ②It is + adj + of sb to do s