Preview the worksheet and predict problem areas. Read over the worksheet and circle any words that you anticipate the learner may have trouble with. While your predictions may not be correct, taking the time to think about the struggles that the learner may face will likely make it easier for you to address such issues should they come up.
Have the learner read the worksheet aloud to you. Select a quiet area with no distractions in which to have this reading take place. Also, seek an area free from the prying eyes -- and ears -- of others to ensure that the adult learner doesn't become self-conscious because of her struggles.
Ask the learner to underline words that present a challenge. After identifying these words, have him look up the definitions or present him with working definitions if there is no time to look things up.
Instruct the learner to paraphrase the worksheet to ensure that she understands. Listen as the learner explains back to you what the worksheet is asking her to do, correcting any errors you notice in her paraphrase to be certain that she can effectively carry out the things that the worksheet is asking her to do.