"Sing Christmas carols"
"She was singing while she was cooking" "My brother sings very well"
"The nightingale was singing"
"the kettle was singing" "the bullet sang past his ear"
"Be careful--his secretary talks"
误 She sang a baby sleeping.
误 She sang a baby having slept.
正 She sang a baby to sleep.
析sing a baby to sleep是习惯用语,意思是“唱着哄婴儿入睡”。