Надо сказать что это не так 1) the baby hippo is learning how to fly. 2)the crocodile sometimes laugh.

Если отрицание то это будет так:1)The baby hippo isn't lerning how to fly
2) The crocodile isn't sometimes laugh.

1. If you  translate this article into Russian, I’ll use it in my report.
2. If she is in Moscow now, she will meet you.
 3. If you do not  hurry, you will miss the train.
 4. If it rains, we shan’t go to the country.
 5. When my friend comes to Moscow, we’ll go to the Bolshoi Theatre.
6. What will you be doing when he comes to your place?
7. Don’t forget to pay for your dinner before you  leave the canteen.
 8. They will lay the table as soon as Marry washes up.
 9. If he does not study hard at his English, he will fail at the examination.
10. If I do not give him the text-book, he won’t learn the material. 

Nowadays nobody doubts that English is one of the international languages around the world. The role of English in the society has significantly increased. Almost every adult in the world dreams of mastering spoken and written English. Moreover, they want their children to speak English well. There are many reasons for that. First of all, anywhere you travel people know this language. Secondly, all business around the world is made in English. In fact every area requires the knowledge of this language. Students know that English plays a significant role in education and their future career. For professionals profound knowledge of English is a good way to get a higher salary and quicker promotion. Thirdly,most books and periodicals are originally issued in English. Moreover, the majority of web sites are maid in English. And, it goes without saying that all computer programs and applications use the English language. Many famous films and songs are also in English. We can go on adding points to this list forever, this already clearly shows that English is the language of the entire world.