| A | B |
| What a person or thing is | Use SER |
| What a person or thing is like | Use SER |
| What a person or thing is from | Use SER |
| What a thing is made of | Use SER |
| To tell who something belongs to | Use SER |
| To tell how a person or thing is at the moment | Use ESTAR |
| To tell how someone feels | Use ESTAR |
| To tell where a person or thing is Located | Use ESTAR |
| SER means | to be and is permanent |
| ESTAR means | to be and is usually temporary |