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1. "She can't concentrate when studying."

2. "Don't waste your time on blaming yourself, just move forward!"

Are they correct? Can they be simplified?

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1. "She can't concentrate when studying."

2. "Don't waste your time on blaming yourself, just move forward!"

Are they correct? Yes

Can they be simplified? Not by much.

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Oaihan Schizeriontime on blaming

We don't use any word between "time" and its associated participle.

spend time doing homework
waste time worrying about tomorrow

The same is true for spending or wasting specific amounts of time.

I've just wasted two hours looking for my lost keys.
Lucille spent three weeks working on that project.

And the same is true with words like "(have) trouble".

I have trouble expressing myself in Russian.
Her husband had a terrible time trying to fix the dishwasher.
The students still have problems working with fractions.

And "be busy".

It seems they were always busy gardening.

CJ