(1)我们自己(used when the object of the verb or preposition is the same people，animals，things as the subject)(反身代词)：We washed～and our clothes in the river.我们在河里洗澡、洗衣服。We saw～in the mirror.我们在镜子中看到了自己。We took it upon～to tell you.我们认为有责任告诉你。

(2)我们亲自，我们自己(used to emphasize，us or the names of the speaker and other people performing an action，etc)(强调，用以加强语气，须重读)：We～played no part in this.我们本身并没有参与此事。We painted the room～.我们自己动手粉刷了房间。

by ourselves 1)单独地：We travelled all by～.我们单独旅行。2)靠我们自己，我们独自地：We made the machine all by～.这机器是我们独立制造的。