

午後十時以後には電話しないでいただけますか。
来週以後になら、時間が取れると思います。
四月以後に入社した社員は、この研修を受けてください。
"いごに(以後に)" is in the lesson "When" (Level 42), along with 11 other useful words. LinDuo has 180 topic lessons like this one, 2,379 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.