[Grammar] I little know // I know little

[wotcha]

1. Little did I know (v)

2. I know little (?)

3. I little know. (?)

4. I know a little. ( v)


Is 2 and 3 grammatical?

 

[MikeNewYork]

1. Little did I know (v)

2. I know little (?)

3. I little know. (?)

4. I know a little. ( v)


Is 2 and 3 grammatical?

3 is not. 2 is grammatical and, under the right circumstances, it can be natural.