When should I use is being in English?
For example, do you say "something is changed," or "something is being changed"?
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For example, do you say "something is changed," or "something is being changed"?
"Is being" is used to describe an action that started in the past and continues at present. So these sentences have different meanings:
One of the uses is simple Present Continuous in passive voice.
My house is being painted by the workers
means exactly the same as
The workers are painting my house
Another is a bit more complicated. Is being may be used to indicate, that someone (rarely something) at the moment possess a quality that they may or may not possess in general.
My brother is being mean.
He may not be mean usually, but right now he is. I say complicated, because there are some instances, where is being is not used.
My wife is mad at me
She's not mad at me usually I hope, but she is mad now. Note, that is being is not used in this context.
"Something is changed" would usually be used as part of a sentence looking to the future after the change: "When X is changed, we can do Y."
Used on its own, "something is changed" sounds a bit odd; we'd normally say "something is different" or "something has changed", which means the change has already taken place.
"Something is being changed" indicates the change is taking place right now; it's roughly the same as "Something is changing."
NOTE: In British English, it is totally acceptable to say the following and the British do that all the time:
John is being very cheeky today.
Paul is being rude this morning.
I am being honest with you.
You are being modest.
Hence, the present conjugated form of 'to be' + being is used as a 'continuous present progressive', something that is currently happening.
In terms of grammar, “something is being changed” is Present Continuous Passive, it means “something is changing now [by someone]”.
Next, “something is changed” is Present Simple Passive and “something has changed” is Present Perfect in passive voice. So each of this forms means exactly what the grammar tense means, but in the passive voice. The passive voice is used (I've just used Present Simple Passive =)) when we want to say that the action is performed on a subject, not a subject performs an action.