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I can think of three ways to say "I remembered to put a pen in my bag"

忘れないでカバンにペンを入れました。

カバンにペンを入れることを忘れなかった。

カバンにペンを入れて忘れなかった。

I think all are technically correct but I'm not sure which is more natural.
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2017-01-25T17:16:00.053
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2017-01-25T17:49:07.150
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question
grammar nuances
Which option is best for saying "I remembered to put a pen in my bag"
Your first and second sentence are the same meaning. 忘れないで～する is a bit
unnatural but 忘れずに～する is natural. And I feel the second one is more literary
than the first.

The meaning of your third sentence are different from the others. This means
"I put a pen in my bag and I didn't forget it."
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2017-01-25T17:48:48.010
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answer
> 忘れないでカバンにペンを入れました。

ないで tends to sound like the negative imperative "Don't do X," so this one
sounds a bit awkward, as if the 忘れないで is part of a quote from which we're
missing the first half. While you can generally use ないで as a negative gerund,
[it typically doesn't imply causality with what comes
afterwards](https://japanese.stackexchange.com/questions/5925/%E3%81%AA%E3%81%84%E3%81%A7-vs-%E3%81%AA%E3%81%8F%E3%81%A6-combining-
phrases-with-negative-verbs). If you'd like to lead with some form of 忘れる
here, you can use 忘れなくて as such:

> [覚えようとしたことを」忘れなくてカバンにペンを入れました。

If you're comfortable with it, you can also use ～ず here, simply replacing
忘れなくて with 忘れず[に]. Personally, I think ず is the best choice for this kind of
sentence, but なくて functions just fine if you aren't there yet.

> カバンにペンを入れることを忘れなかった。

I think this is the most easily understood of the three sentences you've given
us, but I'd suggest using の instead of こと when nominalizing 入れる:

> カバンにペンを入れるのを忘れなった。

To me "カバンにペンを入れることのを忘れなかった" sounds a little like you're talking about an
experience rather than something abstract, like "I remember [didn't forget]
going to put a pen in my bag," and I would somewhat expect to here some
"but/however"-type clause follow. こと tends to sound like one is speaking of
concrete events rather than abstract ideas (e.g. 食べたことありますか？), whereas の can
be much more abstract.

> カバンにペンを入れて忘れなかった。

This sounds like you put the pen in your bag and then didn't forgot about
something while/because you were doing so. The "something" could be the
placing of the pen or anything else depending on the context.

So both 1 and 2 can work, but I think sentence 2 is the most natural sounding.
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answer