Imperative sentences are used to give commands, make polite requests, and give directions.
<Command>
General : Close the door!
Soldier : Yes, sir!
<Request>
Teacher : Close the door, please.
Student : Okay, I’d be happy to.
<Directions>
Nancy : Could you tell me how to get to the station?
Stranger : Certainly. Walk three blocks this street and turn left. It’s on the left hand side of the street.
The difference between the command and a request lies in the speaker’s tone of voice and a use of please.
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ここがとても大切で、命令形を使う時は、言い方によってはとても強く響いてしまうので、要注意です。
だから、相手に嫌な思いをさせないように、pleaseをつけておけば安心です。
ですが、頭にきて『~~して~!!』って強く言いたい時にはこの限りではありませんね。
Please can come at the beginning or end of a request.
Write your name, please.
Please write your name.
The simple form of a verb is used in imperative sentences.
The understood subject of the sentence is you (meaning the person the speaker is taking to )
つまり、
Write your name.という命令文は、
(You) write your name. というように、文頭にYouが隠れている、ということです。