… by oneself …

结构︰

主语（人，物）＋动词＋by oneself…。

说明︰

此句型意为“某人（物）自己…”。反身<代名词>的人称、数和性别，须和相关的<主语>一致。

They went to Suao by themselves.
他们自己去苏澳。
John fixed the tape recorder by himself.
约翰靠他自己修理录音机。
You can’t go mountain climbing by yourself.
你不能自己去登山。