At night是状语,
the moon 是主语
is是系动词
high in the sky是表语
looking like a light是现在分词短语 作伴随状语.
不是因为 你说的原因 因为这是简单句 如果用 It looks like a light.前面必须是句号 或者 加and
At night,the moon is high in the sky looking like a light.
=At night,the moon is high in the sky and looks like a light.
=At night,the moon is high in the sky .it looks like a light.
另外 look这里 是系动词 是没有被动语态的