string

Hi, you concatenated correctly. (combining stuff = concatenation)

The interpolation is not correct however. (inserting stuff = interpolation)

To interpolate you need to break out of the String("") using the backslash \

let interpolatedName = "\(name) , \(greeting) , \(name)"

There is a couple of things. First, your using the same constant name for two constants and that won't work. You have

let name = "Tenzin"
let name = "Linda"

// Should be
let someName = "Tenzin"
let anotherName = "Linda"

You need to have unique names for every constant or variable. The other thing is your string interpolation isn't formatted correctly. If your going to present your constants in the string, you need to have it formatted like this:

let interpolationName = "\(name), \(greeting), \(otherName)"

Hope that helps. Just check your names and your formatting.