使用後
the state of something that has been used once
使用中に
こてを使用する
the action of continuing to use something
まめに使用する
what is left over after spending―the remnant
After inputting
after class
to transact business―(人に頼まれた用なら)―execute a commission
使ってみる
使用中です
how to use anything―directions for use
to use something according to the rules