Present Tense:
* Yo ataco (I attack)
* Tú atacas (You attack)
* Él/Ella/Usted ataca (He/She/You attack)
* Nosotros/Nosotras atacamos (We attack)
* Vosotros/Vosotras atacáis (You all attack)
* Ellos/Ellas/Ustedes atacan (They/You all attack)
Preterite Tense (Past Simple):
* Yo ataqué (I attacked)
* Tú atacaste (You attacked)
* Él/Ella/Usted atacó (He/She/You attacked)
* Nosotros/Nosotras atacamos (We attacked)
* Vosotros/Vosotras atacasteis (You all attacked)
* Ellos/Ellas/Ustedes atacaron (They/You all attacked)
Imperfect Tense (Past Continuous):
* Yo atacaba (I was attacking)
* Tú atacabas (You were attacking)
* Él/Ella/Usted atacaba (He/She/You was attacking)
* Nosotros/Nosotras atacábamos (We were attacking)
* Vosotros/Vosotras atacabais (You all were attacking)
* Ellos/Ellas/Ustedes atacaban (They/You all were attacking)
Future Tense:
* Yo atacaré (I will attack)
* Tú atacarás (You will attack)
* Él/Ella/Usted atacará (He/She/You will attack)
* Nosotros/Nosotras atacaremos (We will attack)
* Vosotros/Vosotras atacaréis (You all will attack)
* Ellos/Ellas/Ustedes atacarán (They/You all will attack)
Conditional Tense:
* Yo atacaría (I would attack)
* Tú atacarías (You would attack)
* Él/Ella/Usted atacaría (He/She/You would attack)
* Nosotros/Nosotras atacaríamos (We would attack)
* Vosotros/Vosotras atacaríais (You all would attack)
* Ellos/Ellas/Ustedes atacarían (They/You all would attack)
Other Tenses:
You can also conjugate "atacar" in other tenses like the present perfect, past perfect, future perfect, and conditional perfect.
Note: The vosotros form is used mainly in Spain and some Latin American countries. In other parts of Latin America, the ustedes form is more common.