I will not let you go. - in this sentence 'go' is a/an

A rolling stone gathers no moss. What 'rolling' is ? The verb form of 'strong' is - What kind of verb is the word 'went' in the sentence: The dog went mad? The girl sings. Here sings is a- Water the plants. The word 'water' is used as- 'He enjoyed sleeping in the open air. Here 'sleeping' is a/a- Which one is irregular verb ? 'Huffing and puffing, we arrived at the classroom door with only seven seconds to spare.' In this sentence the verb 'arrived' is- The reading of history is interesting. এখানে 'reading' কী হিসেবে ব্যবহার হয়েছে? He raised his hand. Here raised is a--verb.