Sy\tmoes\tbesig\tge-wees\thet\tom\tte\ttrek .\tvs .\tSy\tmoet\tbesig\twees\tom\tte\ttrek .
3SG.F\tmust.PST\tbusy\tPTCP-been\thave.INF\tINF.CONJ\tINF\tmove.INF\tvs.\tShe\tmust\tbusy\tbe.INF\tINF.CONJ\tto\tmove.INF
She must have been in the process of moving. vs. She must be in the process of moving.