ser and adjectives

I am =

• Yo soy
• Yo eres
• Yo es
• Yo somos

Tú eres = 

• You are (informal)
• You are (formal)
• You guys are (in Spain)
• You guys are (out of Spain)

She is funny = 

• Ella es cómico.
• Ella es cómica.
• Ella eres cómica.
• Ella eres cómico.

They are intelligent. = 

• Somos inteligentes.
• Sois inteligentes.
• Soy inteligentes.
• Son inteligentes.

We are = 

• Nosotros somos
• Nosotros sois
• Vosotros somos
• Vosotros sois

They are blond. = 

• Son rubio.
• Son rubias.
• Son rubia.
• Marco Rubio.

You guys (in Spain) are = 

• Sois
• Somos
• Son 
• Soy

SER means...

• to be
• to have
• to serve
• to study

What is the error?  "Ella es alto."

• Alto should be alta. 
• It's incorrect to say "ella".
• The verb is conjugated incorrectly.
• It just looks wrong.

What is the error?  Las chicas son ricos.

• It should say "los" instead of "las".
• Son should be sois.
• Son should be somos.
• Ricos should be ricas.