Shift the spotlight: active → passive
In the active voice the subject does the action; in the passive it receives it. Form: the right tense of be + the past participle; the doer, if useful, follows by. (La ciencia usa la pasiva cuando importa la acción, no quién la hizo.)
1 · Choose a sentence
- The object of the active sentence becomes the new subject.
- Keep the same tense of be, then add the past participle.
- Add by + doer only if it is useful.
Same idea, one tense at a time
The passive works in every tense: change the tense of be and keep the past participle. Tap a tense. (Solo cambia el tiempo de «be».)
The lab-report rewrite
A lab report sounds objective when the action, not the person, is the subject. Compare the two versions of the same report.
👩🏫 For the teacher — how this page maps to the manual
- Explore shows Grammar 4's active/passive "spotlight", the three-step tip and when to drop the doer (exception 5). The tense dial is the "passive in every tense" table; the lab-report rewrite is exercise F. Turn on Predict first for "guess before you check".
- Build is productive: students assemble a passive by choosing the tense of be, then transform active sentences (including the two-object and reporting-verb patterns), with instant validation.
- Drill merges the old quizzes into one graded engine (★ identify/choose · ★★ fix the error/complete · ★★★ by/with, two objects, reporting) with a running score and streak.
- Works offline. Reading/writing only — no audio.
Build a passive
Read the active sentence, then choose the tense of “be” the passive needs. The machine builds it — guess before you check.
Drill — one flow, three levels
★ identify & choose · ★★ fix the error & complete · ★★★ by/with, two objects & reporting verbs. Keep your streak alive. (Igual escalera que tu Cuaderno de tareas.)