happen; occur; take place; arise;
happen：1. Do drop in if you happen to be passing! 如果妳碰巧經過時進來坐坐。
來自《簡明英漢詞典》
2. I know that this would happen, first or last. 我知道這事遲早會發生。
來自《簡明英漢詞典》
3. An ageing nuclear reactor is an accident waiting to happen. 老化的核反應堆早晚會出事故。
來自《簡明英漢詞典》
4. You can't sleep out; anything might happen to you. 妳不能離家外宿，妳有可能出事的。
來自《簡明英漢詞典》
5. Just watch what will happen when I press the button. 看著，我按按鈕會發生什麽事情。
occur：
1. Mental and physical deterioration both occur naturally with age. 隨著年齡的增長，心智和體力自然衰退。
來自《簡明英漢詞典》
2. Didn't it occur to you to close the window? 難道妳沒有想到去關窗戶嗎？
來自《簡明英漢詞典》
3. The word "gratitude" did not occur in his words. “感激”兩字在他的話中是見不到的。
來自《簡明英漢詞典》
4. Some movement in the building will occur as It'settles into the subsoil. 樓房沈到下層土時，樓裏就會有動靜。
來自《簡明英漢詞典》
5. The time when a solar eclipse will occur can be calculated. 日食發生的時間可以推算出來。
來自《現代漢英綜合大詞典》
take place：
1. The evening party will take place on New Year's Eve. 晚會將在除夕那天舉行。來自《簡明英漢詞典》2. His graduation will never take place if he doesn't get to work. 他要是不用功就永遠畢不了業。來自《簡明英漢詞典》3. Creative, two-way learning between teacher and pupil can take place. 教師和學生之間創造性的雙向學習是可以實現的。來自《簡明英漢詞典》4. Can I depend on it that this won't take place again? 我能相信這事不再發生嗎？來自《簡明英漢詞典》5. It is not certain when it will take place. 不能確定這事什麽時候會發生。來自《簡明英漢詞典》
arise：
1. Problems arise when the body's immune system is not functioning adequately. 免疫系統不能充分發揮作用時，身體就會出現問題。
來自《簡明英漢詞典》
2. The country's present difficulties arise from the reduced value of its money. 該國目前的困難起因於其貨幣的貶值。
來自《簡明英漢詞典》
3. Accidents often arise from carelessness. 事故常起因於粗心。
來自《簡明英漢詞典》
4. Instability may arise at times of change. 變革時期可能會出現動亂。
來自《簡明英漢詞典》
5. No mistakes could arise. 不會出差錯。
來自《現代漢英綜合大詞典》