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I read a lot of books to improve my english but sometimes I encounter some structures that are not found easily on learning webpages. First, I want to learn forms of being+V3(v3 stands for past participle form of verbs) except by passive voice. For example, I can't deduce the meaning of the sentence.

Class something doesn’t enjoy any advantages by being defined in the same group or being a derived part.

I changed the above sentence to be understood. Here is original:

Class House doesn’t enjoy any advantages by being defined in the same package or being a derived class.)

Second, I again really can't deduce meaning of sentences that use having+v3 structure except by one that is at the beginning of a sentence. (i.e. having worked - After he had worked) What are the forms of having+v3 and being+v3 except by I have just mentioned exceptions and short form of adjective clause.

Example sentences that I can't understand:

It’s important to understand that there’s a difference between the practical knowledge of having worked with Java and the knowledge required to pass this certification exam.

First, answer this question: do you remember having known more than one Amit, Paul, Anu, or John in your life?

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Taking your last example first: do you understand the gerund phrase? This is a phrase that begins with a gerund, where the -ing form of the verb acts like a noun.

I enjoy (sitting on my roof)

I remember (seeing the Beatles in concert)

In the same way "knowing ..." is a gerund phrase that is the object of "do you remember (X)?"

Do you remember (knowing how to play the guitar)?

Take this and change it to the present perfect, which indicates a life experience:

(I have known how to play the guitar.) Do you remember having known how to play the guitar?

(I have worked with Java) Do you recall having worked with Java?

In a similar way, the "to be" verb "is" can be used as a gerund:

(It is open) I remember it being open.

(It is defined in the manual) It is no less confusing, even after being defined in the manual.

This syntax is convoluted and I personally don't recommend using it, if possible. Most of these examples are better when written with simpler grammar:

There is a difference between the practical knowledge you get from working in Java, and the knowledge required to pass this test.

Have you known more than one Amit ... in your life?

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