how many verbs have the yo form as sienta?
CREATE TABLE "present_subjunctive" (
  "verbs" text,
  "yo" text,
  "t" text,
  "vos" text,
  "l_ella_usted" text,
  "nosotros_nosotras" text,
  "vosotros_vosotras" text,
  "ellos_ellas_ustedes" text
);
SELECT COUNT("verbs") FROM "present_subjunctive" WHERE "yo"='sienta';