Please analyse my tenses in my text

[draggy]

Hello teacher,

Please do let me know what mistake that I have done in my text below:

Sorry, I forgot to attach the form before sent.
I had filled up the account maintenance form and if there is any mistake or incorrect that did by me, please feel free to let me know.

By the way, my text analysis result showed:

Readability:
 
Hard Words : 2
Lexical Density: 86.11
Gunning Fog Index: 9.42
Coleman-Liau Index: 7.60

Thank you.

[shalstudent]

Sorry, I forgot to attach the form before sending. I have filled up the account maintenance form and if there are any mistakes or errors done by me, please let me know.

[Anglika]

Sorry, I forgot to attach the form before sending. I have filled up the account maintenance form and if there are any mistakes or errors made by me, please let me know.

.

[rastirizvi@yahoo.com]

Hi Draggy,
Mostly (but not always)we use present participles after preposition like:before sending

Secondly,we do not use "to" with "let".

welcome to correct me if I am wrong.

[Anglika]

Secondly,we do not use "to" with "let". ????

I want you to let me alone

There is a room to let in that house