

天気がいいから、外へ出ましょう。
子どもたちは外へ遊びに行きました。
雨だから、今日は外へ出ません。
"そとへ(外へ)" is in the lesson "Prepositions" (Level 36), along with 12 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.