Answer:
Ser can be in many different forms that are different then your regular -AR, -ER, and -IR conjugations as in:
Yo = Soy
Tú = Eres
Ella/Él/Usted = Es
Nosotros = Somos
Vosotros (Spain Only) = Sois
Ellos/Ellas/Ustedes = Son
Step-by-step explanation:
The reason for some verbs being irregular is because they dont have the regular endings, like lets look at hablar
HABLAR: To speak
This has an AR ending which is regular as you see in other words like: Mirar: To look; Escuchar: To hear; Gritar: To scream.
There is also ER endings: Comer: to eat; Beber: to drink; Correr: to run; Vender: to sell.
Same with IR endings: Escribir: to write; Vivir: to live; Abrir: to open.
Hope this helps!
Tips:
Also you can use Spanishdict.com to help with conjugations!
Duolingo can also help with learning too! Have a great day!