oba czasy, present simple i present continuous, sa uzywane w tego i podobnym typie zdan, i tak jak mg pisze wyzej - continuous tak jakby zabiera cie do tego momentu, kiedy ktos cos mowi/robi, a simple po prostu stwierdza fakt, ze za kazdym razem tak sie ma badz bedzie sie miala dana sprawa
She is as deaf as a post but she always knows what {I talk about}. {=powiem}
She is as deaf as a post but she always knows what {I'm talking about}. {=mowie}
She can tell straight away when {I lie}. {=sklamie}
She can tell straight away when {I'm lying}. {=klamie}