Question

They _____ tennis this
afternoon.
a. are going to playing
b. is going to play
c. are going to play

Answer 1

⭐Hola!, espero te ayude mi respuesta:

They _____ tennis this afternoon.

a. are going to playing

b. is going to play

c. are going to play

Opción correcta: c. are going to play

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Edit:

⭐Estructura del GOING TO (Affirmative):

Sujeto + verb "to be" (am - is - are) + going to + verbo (normal) + complemento.

Ejemplo: She is going to watch TV.

Answer 2

Hola te voy a ayudar!

Respuesta:

They are going to play

Explicación:

He she it es is

You we y they es are

No puede ser playing por que eso es que esta pasando ahora mismo

Espero que te sirva!

Un saludo