The vs no article/ Indirect Question

• The

Before nouns of which there is only one.
Before a noun which has become definite as a result of being mentioned a second time.
Before names of seas, rivers, chains of montains, groups of islands and plural names of countries.

Examples:

The earth is round.
We saw a good film last night. It was the film  your recommended.
The Pacific Ocean.

• No article

We do not use an article when we talk about plural nouns when we are talking generally.

Examples:
Dogs are very intelligent animals.
Companies spend lots of money in adverstising.

• Indirect Question

We use indirect question when we want to make more polite questions. They have an opening phrase before the main question.

Examples:

Where can I buy a good computer?
-Can you tell me where I can buy a good computer?
Are there any internet cafes around here?
-Do you know if there are any internet cafes around here?