There is/ There are

1. There is

1.1. Singular

1.1.1. There is a chair

1.1.2. There isn't a chair

1.1.3. Is there a chair?

2. Hay

3. There are

3.1. Plural

3.1.1. There are some chairs

3.1.2. There aren't any chairs

3.1.3. Are there any chairs?

4. There was/There were

4.1. There was

4.1.1. There was a chair

4.1.2. There wasn't a chair

4.1.3. Was there a chair?

4.2. There were

4.2.1. There were some chairs

4.2.2. There weren't any chairs

4.2.3. Were there any chairs?

4.3. había