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<subject> <predicate> <object-direct> <object-indirect>.
<correl.adverb> <subject> <predicate> <dir.object> <indir.object>.
<predicate> <subject> <object-direct> <object-indirect>?
vat don <subject> <object-direct> <object-indirect>?
vat/vem <predicate> <object-direct> <object-indirect>?
<subject> <predicate> vat/vem <object-indirect>?
vat/vem <subject> <predicate> <object-indirect>?
<subject> <predicate> <object-direct> <preposition> vat/vem?
<preposition> vat/vem <predicate> <subject> <object-direct>?
<correl.adverb> <predicate> <subject> <dir.object> <indir.object>?
<predicate> <object-direct> <object-indirect>!
Should FS include V2? The system described by David Parke in his Frenkisch grammar might be suitable. The advantages are familiarity and normality for all Germanic speakers except the Anglophones, but the disadvantages are extra complexity that makes FS harder and weirder for outsiders, and also the presence of ambiguity in certain places.