A male may sing in a world-city.Logical formLearned from39 sentences. A female may sing (backing vocals).Logical formLearned from39 sentences. A musician may sing.Logical formLearned from39 sentences. A female may sing for some years.Logical formLearned from39 sentences. Birds may sing in trees.Logical formLearned from39 sentences. A dad may sing.Logical formLearned from39 sentences. A male may sing some song.Logical formLearned from39 sentences. A dude may sing.Logical formLearned from39 sentences. A female may sing a composer.Logical formLearned from39 sentences. Grass may sing.Logical formLearned from39 sentences. A person may sing with a band.Logical formLearned from39 sentences. Some men may sing.Logical formLearned from39 sentences. A writer may sing.Logical formLearned from39 sentences. A song may be sung in a language.Logical formLearned from38 sentences. Characters may sing.Logical formLearned from38 sentences.