ない形
nai-kei
Draw one X. Everything else stands on it.
The picture You draw a single X on the spot where the action would have gone. All that changes is what you then say about that X.
Where the picture shows up in ない形
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just the X
今日は残業しない。
kyō wa zangyō shinai
I'm not working overtime today.
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keep the X there
お酒は飲まないでください。
osake wa nomanaide kudasai
Please don't drink alcohol.
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the X as your goal
遅刻しないように、早く出ます。
chikoku shinai yō ni, hayaku demasu
I leave early so I won't be late.
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the X is fine too
明日は来なくてもいいです。
ashita wa konakute mo ii desu
You don't have to come tomorrow.
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the X is not allowed
パスポートを見せなければなりません。
pasupōto o misenakereba narimasen
You must show your passport.
Literally 'if you don't show it, it won't do.' Two X's stacked make an obligation.