Explain how to use "there is" and "there are" in English based on the provided text.

Based on the provided text, here's how to use "there is" and "there are" in English:

• General Use: We use "there is / there are" to say that something exists (or doesn't exist).
• "There is": We use "there is" with singular and uncountable nouns. For example: 'Is there a window near your desk?' 'Yes, there is.'
• "There are": We use "there are" with plural countable nouns. For example: 'Are there any pens on the table?' 'Yes, there are.

In summary, "there is" is for singular things, and "there are" is for plural things.