A scientist intently looks through a microscope in a laboratory.
The lab is empty and no one is there.
There can be either an empty lab or it can be a scientist in there.
exists e1 s1 x1 x2 x3.(a_intently(s1) & Manner(e1,s1) & in(e1,x3) & n_laboratory(x3) & through(e1,x2) & n_microscope(x2) & Actor(e1,x1) & v_look(e1) & n_scientist(x1))
exists s1 x1.(n_lab(x1) & -exists s2 x2.(Theme(s2,x2) & a_there(s2) & n_one(x2)) & Theme(s1,x1) & a_empty(s1))