Identify the underlined clauses

Although Americans love to travel to foreign countries, they seldom seem to speak other languages.

My sister, who teaches Spanish and Italian in New York, says that she had more students twenty years ago

Some people buy expensive cars simply because they can.

Many people hope that Canada can solve its economic problems.

She wrote a book about what she has learned.

What she worries about is the general decline in American language-learning skills.

She believes that American families used to take more pride in learning second languages.

The internet, which has become such a global phenomenon, has contributed to the predominance of English.

The bankers need to know what they should do.

Which one is the person who stole your car?

My sister's conviction is that American students could use the internet to help them learn other languages.

English is the dominant language on the internet because the American computer industry dominates the rest of the world.

He said that he would not come.

We were all curious to know what he had done,

Nobody knows when the registration will begin.

When non-Americans get on the internet, they frequently are trying to improve their English.

What computers have meant to language learning has surprised just about everyone in the academic world.

Wherever there is a large American city, there will be poverty.

The books, which the professor assigned, were very expensive.

Canada might give up its marketing boards if the European community gives up its grain subsidies

That is the place where the two countries fought.

Unless the crown can make a better case, the accused murderer will not be convicted.

It is important to ask whether the wedding is formal or semi-formal.

We all wanted to find out who the winner was.

Whom they were in contact with on the day of the robbery is of great interest to the police.