I am confused with verbs using Shimashou. At first I thought it meant to do something together (Let's do x...) because in most of the examples I heard that was the case. 食べましょう。/ 歩きましょう。 Then I started to see several sentences where it was used, but it meant I will do something. Two examples would be:
How can I tell the difference? I will do/we will do?