Whenever you receive a request from your superior at work, it is very important to make sure that you understand what he asks of you. Not understanding this can lead to many problems for you.
If you are unsure of whether the instructions given are clear, you can try several strategies. First, you can ask him questions in order to make sure that you are understanding him well. Second, you can repeat the instructions back to him in a different way. Finally, you can compare this to other instructions that you have received and check whether they still make sense within the larger context.