First practice with: http://englishwordoftheday2010.blogspot.com/2013/03/man-or-men-pronunciation.html

1’.

Listen and repeat exercise:

1.

short æ (back, have, cat, can, man)

versus e (bend, men, head, every, left)

2.

How to pronounce the EH [ɛ] vs AA [æ] vowels -- compare the pictures and hear the difference in the position for these two sounds: