• Little is used with verbs of thought (realise, know, suspect, etc) and means 'I did not realise/etc at all...
✓ Little did I know how things were going to turn out.
(= I did not know at all how things were going to turn out.)
• With not until and only, you have to be careful about which verb to invert.
✓ Not until I had finished my homework was I allowed to go out.
✘ Not until had I finished my homework I was allowed to go out.
✓ Only when I had finished my homework was I allowed to go out.
✘ Only when had I finished my homework I was allowed to go out.
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