Hello!
To change singular nouns to plural nouns, you add an -s if the ending letter is a vowel. If the last letter is a consonant, you add -es.
To change plural nouns to singular nouns, you remove the -s or -es.
To change "las casas", a plural noun, into a singular noun, it would be "la casa".
Therefore, the singular form of "las casas" is la casa.
https://colombianspanish.co/spanish-schools-colombia
this should help
1. estoy
2.soy
3.estás
4.son
5.está
6.eres
7.estamos
8.está
9.somos
10.está
11.está
12.eres
13.es
14.son
15.están
16.son
17.eres
18.somos
19.está
20.es
21.está
22.está
23.es
24.estamos
25.estoy
hope this helped! let me know if some are incorrect!!
