alone可以作形容词，但是只做表语，不用做定语。
He
was
alone
in
the
house.
也可以做副词。He
came
alone.是‘独自’的意思，不含感情色彩
lonely既可以作定语，也可以作表语。
作表语是‘寂寞’、‘孤立’的意思，一般指人孤独寂寞；作定语指地方荒无人烟，有浓厚的感情色彩
She
lives
alone
,but
she
doesn't
feel
lonely.
She
felt
lonely
when
she
was
left
alone.
a
lonely
place
alone和lonely的用法区分
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