Car elle doubtoyt moult de gesir auec si riche dame; Quant elles furent couchees si commencerent a parler de leurs nouuelles amours; La royne demanda a la dame de mallehault selle a[y]me nulluy par amours, et elle luy dict que nenny.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "commencerent" in a variety of sentences. We hope that you will now be able to make sentences using this word.