A woman gasps while opening a present.
A woman is opening a present.
It  just a rephrase of the sentence  the only difference is the gasps.  the woman is opening a present.
(x)
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_open(e1) & n_present(x2) & n_woman(x1))