Question

help vs 

"i will be fifteen on my next birthday", said tom

-> tom said

jack doesn't buy a new car because he doesn't have enough money

-> if jack

people have used the internet all over the world in recent years

-> the internet has

he left without saying a single word, which was very impolite

-> it was

 

Answer 1

he would be fifteen on his next birthday

had enough money, he'd buy a new car

been used all over the world in recent years

very impolite of him to leave without saying a single word

Answer 2

1."I will be fifteen on my next birthday," said Tom.
→ Tom said that he would be fifteen on his next birthday.

2.Jack doesn't buy a new car because he doesn't have enough money.
→ If Jack had enough money, he would buy a new car.

3.People have used the internet all over the world in recent years.
→ The internet has been used all over the world in recent years.

4.He left without saying a single word, which was very impolite.
→ It was very impolite of him to leave without saying a single word.

Answer 3

1 Tom said he would be fifteen on his next birthday

2 If Jack had enough money, he would buy a new car

3 The internet has been used all over the world in recent year

4 It was very impolite of him to leave without saying a single word