Subjuntivo

Subjuntivo
 

¿Cómo se dice "going to..." pero con el sunjuntivo?

"She was worried that she wasn't going to be able to buy the tickets and understand everything she need to"

"Estaba preocupada que no fuera a poder comprar los billetes y entender todo de lo que necesitaba"

"I'm worried that he's going to hurt himself"

"me preoucpa que fuera a hacerte daño"

The verb tense in the main clause governs the subjunctive tense used in the secondary clause. Your first sentence is correct, because a past tense is used in both the primary and secondary clauses.
Your second sentences uses the present tense in the main clause, so you must use the present subjunctive form of 'ir' in the secondary clause.

Hola:

La preocupaba que no le fuera posible comprar las entradas/los boletos...

Me preocupa que pueda lastimarse/ hacerse daño.
Me preocupa que vaya a lastimarse.