What part of speech is “doing”

'doing' is an action verb that expresses an action that is currently executing, so this verb is usually used with continous tenses. The infinitive form of the verb is ‘to do’, and it conveys the idea of performing an action or creating something. It is commonly used for mundane routines like daily activities and chores, often in the present or past tense.

I am doing my homework right now.

We are still doing the dishes.

the verb ‘doing’ can be used to emphasize how much effort is going into an action. For example, instead of saying 'I’m writing', one can say 'I’m doing a lot of writing' to contribute emphasis to the effort. Additionally, it’s important to note that ‘doing’ has a few idiomatic expressions, such as 'to be in the doing of something', which means to be actively involved in an action.