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I would like to thank all [of] you for taking time to come here.

I would appreciate if you could send me all [of] the information.

All [of] the kids are under 9 years old.

Please let me know in what context 'of' is necessary. I have long suffered from this problem and hope it will go away once and for all.

Thanks in advance.
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New2grammarI would like to thank all [of] you for taking time to come here.
I would appreciate if you could send me all [of] the information.

All [of] the kids are under 9 years old.

Please let me know in what context 'of' is necessary. I have long suffered from this problem and hope it will go away once and for all.

Thanks in advance.

You need (of) in your first sentence.

You could say - I would like to thank you all for taking the time to come here.

In the second two sentences it is optional.
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Could you give me an example when you would definitely use 'of' in "all of the kids"? and an example for all of the information.
New2grammarCould you give me an example when you would definitely use 'of' in "all of the kids"? and an example for all of the information.

I can't see any difference between

Give me all the information.

Give me all of the information.

All the kids said they had enjoyed it.

All of the kids said they had enjoyed it.
Got it. I guess you're saying they are completely interchangeable, regardless of context.
Thanks. Optilang.
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optilangI would appreciate if you could send me all the information.
I would appreciate it if you could send me all the information. ('it' is obligatory)