Phrase
must not
verb
不容
In use
You must not touch the wet paint.
Visitors must not enter the laboratory without permission.
We must not forget to lock the door when we leave.
must not + base verb
You must not touch the exhibits.
您不得触摸展品。
must not + be + past participle
被动形式表示禁止。
The package must not be opened before the date.
包装在日期前不得打开。
Common mistakes
You must not finish the homework today; you can do it tomorrow.You don't have to finish the homework today; you can do it tomorrow.
“must not”表示禁止（不容许），而此处想表达没必要，应用“don't have to”。
You must not to go there.You must not go there.
“must”是情态动词，后直接跟动词原形，不能加“to”。
Connections
Learner notes
Grammar Note
表示禁止，后接动词原形
Dictionary facts from WIKTIONARY.