What kind of verb is the word 'went' in the sentence: The dog went mad?

'The door opened automatically'. The verb is this sentence is- 'Swimming' is a good exercise, here 'Swimming' is - The word "flying" in the sentence "Look at the flying bird" is a: The verb form of 'deceit' is- "I water the plants." The word 'water' is used as- A swimming snake bit him in the leg. Here 'swimming' is a- He writes a letter. In this sentence, 'write' is a- The reading of history is interesting. এখানে 'reading' কী হিসেবে ব্যবহার হয়েছে? Suddenly finding himself alone, he became frightened. A rolling stone gathers no moss. What 'rolling' is ?