Is it correct to say "I penned it down"?

[bit3034]

Please confirm, can I add "it" after penned in the sentence "I penned it down"?

 

[Rover_KE]

What's the context?

 

[bit3034]

If I'm referring to a note which I had written then can I use "it" ?

 

[emsr2d2]

Please confirm, Can I add "it" after "penned" in the sentence "I penned it down"?

If I'm referring to a note which [that] I had written, then can I use "it"?

Please note my corrections above.

I find "I penned it down" unnatural, verging on ungrammatical. We usually use "to pen" when we're talking about someone authoring something. For example, "William Shakespeare penned Romeo and Juliet".
You're trying to use it as a replacement for "to write" when simply talking about using a pen and paper to transcribe something. We use "I wrote it down", "I noted it down" and "I jotted it down". The second and third might be used for shorter notes like reminders or shopping lists.

You asked "Can I add "it" ..." as if you thought the sentence would be grammatical without it. It wouldn't. You can't say "I penned down" either. We don't use "down" after any form of the verb "pen".

 

[bit3034]

Thanks @emsr2d2 , I noted your corrections however I have queries about two of the corrections made.

1. You removed "then" after if, I know it's not necessary to use "then" after "if" but is it incorrect to use it at all?
2. Can't I use "Please confirm" before a question, as I did?

 

[Tarheel]

Forget about "Please confirm" in such a context. Instead, use it for something like a reservation.

 

[Tarheel]

The word "then" is far removed from "if" in the sentence in question.

 

[Tdol]

I wrote it down = I have a written record

 

[emsr2d2]

Thanks @emsr2d2 , I noted your corrections. However, I have queries about two of the corrections. made.

1. You removed "then" after "if". I know it's not necessary to use "then" after "if" it but is it incorrect? to use it at all?
2. Can't I use "Please confirm" before a question, as I did?

Note my corrections above.

1. Learners (and some natives) have an annoying habit of putting "then" in all kinds of places where it's not necessary or appropriate. I'm aware that the standard (taught) construction if "If A then B", but that generally refers to cause and effect.

2. As Tarheel said, "Please confirm" is better used in other contexts. If you had presented us with a language point that you believe to be true and want us to confirm/deny it, you could say something like "Please confirm whether my understanding is correct".

 

[bit3034]

@emsr2d2 May I know the reason for removing "made" at the end of my sentence?

 

[emsr2d2]

@emsr2d2 May I know Can you tell me the reason for removing "made" at the end of my sentence?

You can say "I have queries about two of the corrections" or "I have queries about two of the corrections that were made" but "... corrections made" is unnatural.
Note that that isn't an absolute rule. With a different word order, it's OK. For example, you could have said "Two of the corrections made in that post confuse me". There, it's OK to omit "that were".

I'll anticipate your next question and tell you that I changed "May I know" to "Can you tell me" because "May I know" is old-fashioned and unnatural.

 

[bit3034]

Thanks once again @emsr2d2 for patiently and promptly replying to all my queries. I hope this time I haven't written anything unnatural.

 

[Tdol]

All good.