by using it + infinitive

1. It s fun to play tennis
2. It is important to be polite to other people
3. it is interesting to learn about other cultures
4. it is dangerous to walk alone at night in part of the city
5. Is it difficult to learn a second language?
6. is it easy to ride motorcycle?
7. it isn't much fun to have a cold
8. it takes a long time to learn a second language
9. it takes three minutes to cook a soft-boiled egg

semoga membantu :)