She used to sing songs to calm herself in the dark.

她以前在黑暗中唱歌来让自己平静。

同一单元的其他句子

• I used to be afraid of the dark, but now I am not.我过去害怕黑暗，但现在不了。
• Did you use to be scared of monsters under your bed?你过去害怕床下的怪物吗？
• She used to sleep with the light on every night.她过去每晚都开着灯睡觉。
• He is no longer afraid of the dark because he has a nightlight.他不再害怕黑暗，因为他有夜灯。
• Why were you so frightened during the power cut?停电时你为什么那么害怕？