sentence: Last month , a monument was erected in their memory so that nobody forgets what happened in that large forest where - as the people would say in that time - German soldiers could not guard the whole wood , unless they stood behind each spruce ....
modified: Last month a monument was erected in their memory so that nobody forgets what happened in that large forest where - as the people would say in that time - German soldiers can not guard all wood , unless they stood behind each spruce ....
transformation: PUNCT, VERB:TENSE, OTHER