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Hi,everyone[H]

Thanks for your help in advance.

I cannot understand the form of present continuous tense of "to be being".
Examples:
1)He is being lazy now.

According to my grammar book,it means "I'm behaving/I'm acting"
2)I cannot understand why he's being selfish.(being selfish = behaving selfishly at the moment)
but * He never thinks about other people. He is very selfish. (not 'he is being') (= he is selfish generally, not only at the moment)

We use am/is/are being to say how somebody is behaving ?

Why or when will we use this form of "to be being" ?When someone is behaving,like
She is being beautiful =She is "beautifuling" ?
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It only works with adjectives that have some volitional element. 'Beauty' is not controllable in the way that 'selfishness' is. Beauty is not a behaviour or action.
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If so,that why/when will we use this form "to be being" ?

If i say that he is being lazy that means he is "lazying"/is doing "idleness" ?

When will we say someone is being selfish,pride,modest...etc?

Thanks^^
If i say that he is being lazy that means he is "lazying"/is doing "idleness" ?-- The underlined phrase is not English, but that's what it means.

When will we say someone is being selfish,pride,modest...etc?-- When the person is exhibiting that trait for and at the moment.