This can be a very challenging task, namely because when the two notes are played together, an interval and its inversion can sound almost alike.
Here is a chart showing each interval and its inversion.
|Minor 2nd||Major 7th||Strong Dissonance|
|Major 2nd||Minor 7th||Weak Dissonance|
|Minor 3nd||Major 6th||Imperfect Consonance|
|Major 3rd||Minor 6th||Imperfect Consonance|
|Perfect 4th||Perfect 5th||Perfect Consonance|
Then you can design a lesson which targets your specific weaknesses.