Request or Orders

The order (imperative) form in Japanese can be made in several politeness levels. Just note that the casual forms can be seen as very rough and inpolite.

Polite level

The polite level order form is made as an request using the -te form of a verb, and adding kudasai.

• 聞いてください
  kiite kudasai
  Please listen
• 吸わないでください。
  suwanaide kudasai
  Please do not smoke.

Casual Level

The casual request / order form is just the plain -te form of a word. 

• 聞いて。
  kiite
  Listen.
• 吸わないで。
  suwanaide
  Don't smoke.

Teinei - Formal Polite Level

When talking teinei, the formal polite language, many words are exchanged to completely different words. Here are some examples of how you can do for words that does not have a special word in teineigo.

• おかけください。
  o kake kudasai
  Kindly have a seat.

• 御かけにならないでください。
  o kake ni naranaide kudasai
  Kindly refrain from sitting down.

Rough Orders

Rough orders are done differently depending on the verb group.This form is rarely used except from when fighting, so please be very careful when using it.

• Group 3 (suru, kuru) : only two examples
  yare / yaruna, koi/kuruna
• Group 2 (-eru => -ero , -iru => -iro) : Change the end to -ero or -iro respectively for positive orders. For negative orders, just add na after the plain positive form.
• Group 1 (other verbs) : Change the last -u in the plain positive form to -e to make the positive order. For negative orders, just add na after the plain positive form.

• 聞け！
  kike! (from kiku, verb group 1)
  Listen!
• 座れ！
  suware! (from suwaru, verb group 1)
  Sit down!
• 食べろ！
  tabero! (from taberu, verb group 2)
  Eat!
• 見ろ！
  miro! (from miru, verb group 2)
  Look!
• 来い！
  koi! (from kuru, verb group 3)
  Come!
• ここで吸うな！
  koko de suu na.
  Don't smoke!