Choose the best answer that has the same meaning to the first one.

Prince Charles is heir to the thorne of England. His wife was Princess.

My friend, Peter, who plays the guitar, has just released a CD.

My friend, Peter, who has just released a CD, plays the guitar.

My friend, Peter, who playing the guitar, has just released a CD.

My friend, Peter, who has just released a CD, playing the guitar.

Microsoft has a lot of power in the world of computers, that annoys some people. 

Microsoft has a lot of power in the world of computers, annoying some people.

Microsoft has a lot of power in the world of computers, annoys some people.

Microsoft has a lot of power in the world of computers, which annoys some people.

The Euro replaced a number of national currencies which was introduced in January 2002.

The Euro replaced a number of national currencies introducing in January 2002.

The Euro replaced a number of national currencies to be introduced in January 2002.

The Euro replaced a number of national currencies to have introduced in January 2002. 

Friends, is one of my favourite series, ran for ten years.

Friends, one of my favourite series, ran for ten years.

Friends, ran for ten years, is one of my favourite series.

Friends, which ran for ten years, one of my favourite series.

If could swim, I will go scuba diving with Jack.

Unless I can swim, I’ll go scuba diving with Jack.

Unless I could swim, I will not go scuba diving with Jack.

If I could swim, I’d go scuba diving with Jack.

We'd order a pizza if we had enough money. 

We'd order a pizza unless we didn’t have enough money.

We won’t order a pizza unless we have enough money.

We order a pizza if we had enough money.