work together

[Anonymous]

Are these all OK and natural?

1. Let's work on this together.
2. Let's work together on/with this.

Thanks.

[Pete]

Are these all OK and natural?

1. Let's work on this together.
2. Let's work together on/with this.

Thanks.
They all sound natural to me except the version using "with". That would certainly mean something other than the sentences using "on". You work on a project; you work with a tool. In the right context, it would be ok.