<span class="searchmatch">grouillait</span> third-person singular imperfect indicative of grouiller...
je/ grouillent /ɡʁuj/ imperfect grouillais /ɡʁu.jɛ/ grouillais /ɡʁu.jɛ/ <span class="searchmatch">grouillait</span> /ɡʁu.jɛ/ grouillions /ɡʁuj.jɔ̃/ grouilliez /ɡʁuj.je/ grouillaient /ɡʁu...