Explain how can we differentiate between the mesial and distal in the aspects of the mentioned teeth

Explain how can we differentiate between the mesial and distal in the aspects of the mentioned teeth
1. labial aspect of of maxillary central incisor
2. lingual aspect of of maxillary canine
3. mesial aspect of of maxillary 1st premolar
4. occlusal aspect of of mandibular 2nd premolar
5. occlusal aspect of of maxillary 1st molar
6. occlusal aspect of of mandibular 1st molar