The present participle is formed by adding "ing" to the base verb, which in this case is "begin".
For example, "He is beginning his new project" or "The children are beginning their journey".
The present participle form is used to show an ongoing action or an action happening at the same time as another action in the past, present, or future.
It is important to note that the present participle form can also be used as a gerund, functioning as a noun in a sentence. For example, "Beginning a new chapter in life is always exciting".
In summary, to form the present participle of "begin" in English, simply add "ing" to the base verb "begin".