The woman sits on the steps outside.
The woman is sitting.
Saying the woman sits conveys that the woman is presently sitting outside.
exists e1 s1 x1 x2.(n_step(x2) & n_woman(x1) & a_outside(s1) & Manner(e1,s1) & on(e1,x2) & Actor(e1,x1) & v_sit(e1))
exists e1 x1.(n_woman(x1) & Actor(e1,x1) & v_sit(e1))