subseguir - to follow immediately, to continue
substituir - to substitute
subyugar - to subjugate
suicidar - to commit suicide
sumir - to plunge
supervisar - to supervise
surcar - to plough
surmergir - to submerge, to plunge, to sink
sustraer - to steal, to remove, to subtract
socavar - to dig
sentirse - to feel (reflexive)