x1=s1=m1 is the material environment/surrounding material (i.e. gaseous/liquid atmosphere, vacuum, etc.) enclosing x2=s2 in direction(s)/dimensions(s)/plane x3=s3=m3, of type/composition including x4=m2.
x1 expects/looks for the occurence of x2 (event), expected likelihood x3 (0-1, default li so'a (i.e. near 1)); x1 subjectively evaluates the likelihood of x2 (event) to be x3.
marks word as being optional, i.e. the bridi would still be both grammatical AND reflect the speakers opinion/intention would the marked construct be left out