You were planting a bed of begonias round by the south side of the house yesterday afternoon, were you not, Manning?
Manning is believed to have been planting begonias and daisies yesterday afternoon. 
mnli hypothesis: Manning is believed to have been planting begonias and daisies yesterday afternoon.  premise: You were planting a bed of begonias round by the south side of the house yesterday afternoon, were you not, Manning?