Is that sentence correct???

[dilekdemir89]

I will never forget your this help.

Is that sentence correct? Thanks in advance..

[tedtmc]

Wrong. I will never forget your help.
Why would you want to use 'this' before 'help'?
Probably a direct translation from another language eh?

[Casiopea]

Additionally,

I will never forget your help.
I will never forget this help.

Both your and this function as adjectives: 'your help' and 'this help'. But they also function as determiners and, in English, there can be only one determiner per noun - which is why 'your this help' doesn't work.

I will never forget your this help.

[dilekdemir89]

Thanks both of you

[Casiopea]

You're welcome.