1. Children learn a lot about how to behave in a situation like this
-> Only by learning a lot can children know how to behave in a situation like this .

2. You can use it as long as you like, and it will not wear out.
-> No matter how long you use it, it won't wear out .

 3.You needn't make an appointment to se thee personnel manage.
-> There's no need for you to make an appointment to see the personnel manager .

4 .The train journey from London to Bristol takes two hour.
-> It is a  two-hour train journey from London to Bristol  .

5. If you don't believe in it, you will able to do it.
-> Believe in it or you'll never be able to do it .

6. The patient recovered more rapidly than expected.
-> The patient made a more rapid recovery than expected .

7. You practice a lot,and you will play well
-> The more you practice, the better you will play. 

8. The Prime Minister resigned because of his sudden illness
-> The Prime Minister's resignation resulted from his sudden illness.  

9. Be sure to say googbye to your grandmother before you leave

-> Be sure not leave without saying good bye. 

10. Your car might break down on the rough mountain road, so take plenty of spare parts.
-> In case your car breaks down on the rough mountain road, take plenty of spare parts .

1.Only in a situation like this do children learn a lot about how to behave

2.No matter how long you use it,it won't wear out

3.There's no need to make an appointment to see the personnel manager

4.It is a two hours train journey from London to Bristol

5.Believe in it or you will never able to do it

6.The patient made a more rapid recovery than expected

7.The more you practice,the better you'll play

8.The Prime Minister's resignation resulted from his sudden illness

9.Be sure not to leave without saying goodbye to your grandmother

10.In case your car breaks down on the rough mountain road,take plenty of spare parts