Answer:
3. Tu vas a llamar
4. Ellos van a buscar
Step-by-step explanation:
Remember, infinitives are a basic form of a verb. It's the word BEFORE you conjugate it. For example, conjugate the word jugar/play (the infinitive is jugar/play) in the present, past, and future;
Yo juego - I play
Tu juegas - You play
El/Ella/Ud. juega - He/She/It plays
Nosotros jugamos - We play
Vosotros jugais - You all play
Ellos/Ellas/Uds. juegan - We play
Yo jugue - I played
Tu jugaste - You played
El/Ella/Ud. jugo - He/She/It played
Nos. jugamos - We played
Vos. jugasteis - You all played
Ellos/Ellas/Uds. jugaron - They played
Yo jugare - I will play
Tu jugaras - You will play
El/Ella/Ud. jugara - He/She/It will play
Nos. jugaremos - We will play
Vos. jugareis - You all will play
Ellos/Ellas/Uda. jugaran - They will play