

寒いから、窓を閉めるね。
ドアを閉めるのを忘れないでください。
暗くなったから、カーテンを閉める?
"しめる(閉める)" is in the lesson "Verb antonyms" (Level 8), 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.