Interested in Language
without be verb it can form -ing. For an example."You can be rich by using..."
could you explain why it can be like that, please?
besides "by" any word can be form -ing without be verb?
EX: . . . by using . . .
In that context "by" means, through the action of. It's a preposition, and prepositions require an object. "using" is its object. It's a noun, not a verb. A noun that ends in -ing is called a gerund. It looks a verb, but it's not. Here are a few examples of gerunds:
Swimming is fun. <subject>
I like climbing mountains. <object of the verb "like">
One of my hobbies is using the computer. <complement>
I'm reading a book on writing. <object of the preposition "on">
Since gerunds are nouns, they can do everything a noun can do. That is, they function as a subject, as the object of a verb, and as the object of a preposition.
Hope that helps.