Predicate: maSoHuwb
Roleset id: 01 , accompanied
        Arg1: accompanied thing
        Arg2: by what /whom? (marked by ب)
Frame:
(S
(CONJ و)
(VP
(PV+PVSUFF_SUBJ:3MS سيطر)
(PP-CLR
(PREP على)
(NP
(DET+NOUN+NSUFF_FEM_SG+CASE_DEF_GEN المنطقة)))
(NP-SBJ
(NP
(NP
(NOUN+CASE_INDEF_NOM ضغط)
(ADJ+CASE_INDEF_NOM جوي)
(ADJ+CASE_INDEF_NOM منخفض))
(SBAR
(WHNP-2
(-NONE- 0))
(S
(VP
(ADJ.VN+CASE_INDEF_ACC مصحوبا)
(NP-SBJ
(-NONE- *T*-2))
(NP-OBJ
(-NONE- *-2))
(PP-CLR
(PREP ب)
(NP
(NOUN+CASE_INDEF_GEN كتل)
(ADJ+NSUFF_FEM_SG+CASE_INDEF_GEN هوائية)
(ADJ+NSUFF_FEM_SG+CASE_INDEF_GEN باردة)))))))
        Arg1 : -NONE- *T*-2 > ضغط جوي
        Gloss: it
        Arg2 : بكتل هوائية باردة
        Gloss: by cold air masses