

先に下へ行っていますね。
ご飯ですよ。下へ来てください。
エレベーターで下へ行きますか。
"したへ(下へ)" is in the lesson "Adverbs 1" (Level 23), along with 15 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.