Don't forget for each sound you need to put double slash or bracket.
/ m / / n /
[ m ] [ n ]
/ m /
Tongue tip :
Between the teeth
Airstream :
Continuous without interruption
Vocal cord : Not
vibrating
For Example : Thorn,
Method, and Path
/ n /
Tongue tip :
Between the teeth
Airstream :
Continuous without interruption
Vocal cord :
Vibrating
For Example : Those,
Brother, and Smooth
And here are the video on Youtube to hear clearly each sound
American style
/ m / https://www.youtube.com/watch?v=tkiN8BsBEfA
/ n / https://www.youtube.com/watch?v=1eyr7O4TFmI
British Style
/ m / https://www.youtube.com/watch?v=_o7H0eoj2SI
/ n / https://www.youtube.com/watch?v=vDrdgvk-G30
