知りませんでした or 知っていませんでした?


> A 「宿題はもう出しましたか」  
>  B 「いいえ。昨日宿題がありましたか。私は___」
>
>   1. 知りませんでした
>   2. 知っていませんでした
>   3. 覚えません
>   4. 覚えませんでした
>

I am a little confused because I don't quite catch the difference between the
first two options. There was a similar exercise before and I think I ended up
using the -te imasu form but now I am doubting it. They give us a lot of
multiple choices with all the grammar until now (N5, although sometimes there
are from upper levels in-between) and for some reason they are all hiragana.




I am Japanese and I've been learning English for a few years but I'm not good
at English.

First one is correct and second one is incorrect due to Japanese people never
say "知っていませんでした". I think "知っていませんでした" is weird. I'm sorry I cannot explain
the reason why I think it's weird correctly but I can tell you some correct
forms like below.

We always say like this and this means we never says another forms.  
Positive form  
1."知っています"  
2."知っている"  
3.”知ってる”  
Negative form  
4."知らない"  
5."知りません"  

If you have any question, please feel free to contact me and I will
investigate and tell you as much as I can

