It + be + adj + (for O) + to V ( CN giả ) 
("thật là thế nào để làm gì", "làm gì đó thì như thế nào" hoặc "thật như thế nào để ai đó làm gì", "ai đó làm gì như thế nào")

1. Supporting the victims after the disaster was kind of them.

⇒It was kind of them to support the victims after the disaster.
2. Valuing the improved living conditions we have today is necessary.

⇒It's neccessary to value the improved living conditions we have today.

3. Crossing the road without looking left and right was stupid of you.

⇒It was stupid of you to cross the road without looking left and left.

4. Going into the lift alone is afraid.

⇒It's afraid to go into the lift alone.

5. Following the instructions carefully is important for all of us.

⇒ It is important for all of us to follow the instructions carefully.

6. Being able to build the country into a powerful one is certain.

⇒It is certain to be able to build the country into a powerful one.

7. Speaking English with the foreigners is confident.

⇒It is confident to speak English with the foreigners.

8. Showing us the way to train station was kind of them.

⇒It was kind of them to show us the way to train station.

9. Using a long stick to get some fruits was very clever of him.

⇒It was very clever of him to use a long stick to get some fruits.

10. Finding a parking space in the city centre is not easy for you.

⇒It is not easy for you to find a park space in the city center.