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Derek voiced concern about the future survival of various species of sharks, which are being captured and de-finned for shark fin soup, considered a rare delicacy in Asia and in the United States.

"It's very difficult to know how many there are left in the world," Derek said. "Some studies show that in the past 20 years, they're down 90 percent. They reproduce very slowly. I think that unless people just stop eating the (shark fin) soup, I don't think the species has a chance."

Is there optional or incorrect to have?

Thanks
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I'm not sure what your question is.
It's very difficult to know how many there are left in the world,"
or
It's very difficult to know how many are left in the world,"
Optilang, I wanted to know whether 'there' is mandatory.

How should I rephrase my question to make it clear?
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Is there optional or incorrect to have?

Is (the use of) 'there' optional?
Thanks, Optilang. And your answer is Optional, right?
Thanks, Optilang. And your answer is Optional, right?

For me, yes
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Opti, when you're cutting and pasting, could you either use a differen color or actually use the quote feature? It can be confusing for people (well, for me at least) to know where the qutoed material ends and the new response begins. Thanks!
Point taken GG - I know I'm getting better slowly at using this - please bear with me - I'm trying to make improvements. Apologies for any problems caused.
For reasons that aren't clear to me, sometimes I have to click on the Quote button twice to get it to work. But you can select the text you've copied and make it blue, for example, to show that it's the other person's text. I also noticed (although I don't know if this works all the time) that if you hit tab and put a - and then paste in the text, it appears in a quote box. Weird, but I was able to get it repeat.
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