• it isadj. of(for) sb...
• It is + adj. of(for) s...
• It is + adj. of(for) s...
• It is + adj. of sb. to...
• It is + adj. of(for) s...
• It is 句型
• it句型总结
• it强调句型
• Where is it
• 动词+sb of结构