Ok i dont play much heads up but lets say you are playing a villan with the following characters.

1 he will raise from the BB over 80 percent of the time if you limp from the sb.
2 he loves to attack checks a lot and will bet against a check around 75 percent of the time.
3 It is nearly impossible to make him fold even bottom pair or ace high even check raising or reraing th turn will not get him to fold.