YOU SAID:

I have been here so many times and I have never noticed that; how is that?

INTO JAPANESE

私は何度もここにいましたが、私はそれに気付かなかったのです。それはどうですか？

BACK INTO ENGLISH

I stayed here many times, but I did not notice it. How is that?

INTO JAPANESE

私は何度もここに泊まったが、私はそれに気付かなかった。それはどうですか？

BACK INTO ENGLISH

I stayed here several times, but I did not notice it. How is that?

INTO JAPANESE

私は何度かここに泊まったが、私はそれに気付かなかった。それはどうですか？

BACK INTO ENGLISH

I stayed here several times, but I did not notice it. How is that?