My preference for this kind of direct grammar teaching is a flipped classroom model. Students could watch this free video: https://www.youtube.com/watch?v=Y30Iy-F8AFU&feature=youtube_gdata
and take notes for homework, then use their notes (or memories) to fill out these "skeletal notes" (partially completed notes) in groups, in class, while teacher circulates to see if they are understanding. Results in less time teaching grammar in the classroom and more time available for applying these language pieces in communicative activities.
The activity on the second sheet prompts students to write a problem (Tengo mucha tarea) then let every paper be passed around so that every student can write a recommendation in the conditional tense. I would even teach them...if I were you (Si yo fuera tú) ...
Afterwards, 10-15 minute discussion to let students tell teacher what other students wrote to them. ("Yo escribí 'Tengo much tarea' y alguien puso 'Yo iría a la biblioteca para estar más tranquilo' ")
See below other Spanish Verb Tense Skeletal Notes with Engaging Activities:
preterite sekeletal grammar notes -- formación del pretérito Spanish
present perfect _ perfecto Notes , Interview & Activities Spanish
el tiempo futuro Future tense Spanish notes, wrksht, interview, write letter
Subjunctive mode -modo subjuntivo -basic structures that provoke subjunctive
MY FAVORITE: Imperfect-tense-imperfecto-Spanish-Interview-activity-Cuando-era-pequeno