英文句子到底可不可以用 "And" 或是 "But" 來開頭？這倒不是"可以"或是"不可以"的問題。對learners來說，在寫作時表達錯誤的情況遠大於懂得正確表達，所以就算是"可以"還是有可能會寫出有問題的句子。其它的話就看:
1. https://www.dictionary.com/browse/and 或是 https://www.collinsdictionary.com/us/dictionary/english/and
→ Usage note
Both AND and BUT, and to a lesser extent OR and SO, are common as transitional words at the beginnings of sentences in all types of speech and writing: ... Any objection to this practice probably stems from the overuse of such sentences by inexperienced writers.2. 如果要專看Academic text(因為這需要formal style)那麼可以查這個語料庫:
http://www.americancorpus.org/ （以 "And" 為例子。下方的截圖是舊的，現在的格式可能有變）
我再提醒一次，對learners來說，重點其實是前頭Usage note提到的:
"Any objection to .... by inexperienced writers."
