The correct sentences are 'Ana le duelen las muelas' (1), 'A Mario y a Pedro les duelen los pies' (2), 'A Tomas le duele la cabeza' (3) and 'A Jorge y a Teresa les duele la espalda' (4).
- Spanish verbs always are composed of a particular stem and one general ending.
- All Spanish verbs end in -ar (e.g., amar), -er (e.g., doler) or -ir (e.g., seguir).
- The Spanish verb 'doler' (ending -er) means 'pain' in English.
In conclusion, the correct sentences are 'Ana le duelen las muelas' (1), 'A Mario y a Pedro les duelen los pies' (2), 'A Tomas le duele la cabeza' (3) and 'A Jorge y a Teresa les duele la espalda' (4).
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