JLPT N4

～なさい

Do ~ (command/instruction)

Structure

Verb (stem form) + なさい

This is a command or instruction, milder than the plain imperative form, often used by parents to children or teachers to students.

早く寝なさい。

Go to bed early.

Using it with strangers or superiors; it sounds arrogant.

Think of it as 'you should do...', implying a gentle but firm instruction.

Import an article and tap any sentence using it. The explanation comes back about the sentence in front of you, not a textbook example.