Convert if else structure into switch case in swift

I am pretty new in programming, I am trying to convert this if else structure into Switch cases in Swift language, i appreciate your help, thanks.

here is my code

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if (segue.identifier == "ShowDefinition") {
        if let destinationViewController = segue.destinationViewController as? EnglishViewController {
            if let definition = sender as? String {
                if definition == "Abstraction" {
                    destinationViewController.titleMsg = "Abstraction"
                    destinationViewController.definitionMsg = "definition 1"
                } else if definition == "Binary System" {
                    destinationViewController.titleMsg = "Binary System"
                    destinationViewController.definitionMsg = "definition 2"
                } else if definition == "Computer" {
                    destinationViewController.titleMsg = "Computer"
                    destinationViewController.definitionMsg = "definition 3"

                } else if definition == "Internet" {
                    destinationViewController.titleMsg = "Internet"
                    destinationViewController.definitionMsg = "definition 4"

                } else if definition == "Virtual Reality" {
                    destinationViewController.titleMsg = "Virtual Reality"
                    destinationViewController.definitionMsg = "definition 5"

                }
            }
        }
    }
}