Crucigrama grammar Versión en línea will help ss ti remeber the structure of the language por Michel González Cruz 1 we use the auxiliary have plus been plus the verb in gerund 2 we use the auxiliary be plus the verb in gerund 3 we use the auxiliary have or has plus the verb in participle 4 we use the auxiliari be in past plus the verb in gerund 5 we use the auxiliary had plus the verb in participle 6 we use the verb in past simple 5 6 2 1 4