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It is clear ( obvious, true, possible, certain....) that .....
该句型中it 是形式主语，真正的主语是that 引导的主语从句，常译为“清楚（显然，真的，肯定……）” 是主语从句最常见的一种结构。
It is very clear that he’ s round and tall like a tree.
= That he’s round and tall like a tree is very clear.
4. It is important (necessary, right, strange, natural...) that ...
该句型和上一个同属一个句型。由于主句中的形容词不同，that 后的从句中要用虚拟语气（should + 动词原形），should 可以省去。建议记住该句型中的形容词。
It is important that we (should) learn English well.
It is necessary that he (should) remember these words.
Step 1 Presenting the structure of “It is + 形容词 + of sb. to do sth.”和“It is + 形容词 + for sb. to do sth.”
In the text on page 94 there is a sentence: It is necessary for you to support and help each other before and during the event.
“It is + 形容词 + of sb. to do sth.”和“It is + 形容词 + for sb. to do sth.”这两个句型使用频率都很高，前者表示说话人对客观事物的高兴、惊讶、遗憾、难过等情绪，表现的是人的性格、品质或特征，经常可以转换成：
How + 形容词 + it is + of sb. to do sth.!
How + 形容词 + of sb. to do sth.!
Sb. + is + 形容词 + to do sth..或
That is + 形容词 + of sb. to do sth.等；
后者表示说话人对客观事件的决断性，根据具体情况可以转换成：
To do sth. is + 形容词；
It is + 形容词 + that 从句；
或③Sth. Is + 形容词 （for sb.）to do.等。如
It is possible to work out problem. 有可能解决这个问题。
Is it necessary to complete the design before National Day? (MET 89) 在国庆前完成这一设计有必要吗？
It is stupid of him to refuse the invitation. 他拒绝了邀请，真是件错事。
→How stupid it is of him to refuse the invitation!
→How stupid it is to refuse the invitation!
→He is stupid to refuse the invitation.
It is better for you to live alone for some time. 你单独住一段时间更好。
→To live alone for some time is better.
→It is better that you live alone for some time.
Step 2 Practicing
Now go to do the exercises on page 99, checking the answers with your partners.