Which of the following words can be used as a verb?

Reading is an excellent habit. Here the underlined word is a- What is the form of parts of speech of 'may'? A swimming snake bit him in the leg. Here 'swimming' is a- Education is enlightening. Here 'enlightening' is – Which of the following word is 'verb'? The girls water the plants. Here 'water' is- He fathered the plan. Here the word 'father' is_ The word "flying" in the sentence "Look at the flying bird" is a: Suddenly finding himself alone, he became frightened. He writes a letter. In this sentence, 'write' is a-