Questions & Answers about Lütfen sakin konuş.
- Lütfen = please
- sakin = calm, calmly, or sometimes quiet/calm in manner depending on context
- konuş = speak! / talk!
So the sentence is literally something like Please, speak calmly.
Turkish often leaves out subject pronouns when they are already clear from the verb form.
In konuş, the form shows that the speaker is addressing you in the singular informal sense, so sen is not needed.
You could say Sen lütfen sakin konuş, but that usually sounds unnecessary unless you want emphasis.
Konuş is the imperative form of the verb konuşmak (to speak / to talk) for second person singular.
So:
- konuşmak = to speak
- konuş = speak!
This is the form used when telling one person to do something.