Which in turn can quite often turn into a temper tantrum. He will not be able to reason just yet, toddlers often make this situation worse if they are tired. For the adult, the way to help toddler is to understand the problem and explain it to him. This way it helps the toddler to think things through and then they can begin to understand.
Another factor that can confuse the toddler is when there are more than the one adult looking after them, i.e if the mother has her routine with toddler, then the toddler stays with family