“However” 是英语中一个非常常用的转折连词，用来引出与前面内容相反或不同的观点、信息或情况。它的用法和位置相对灵活，但掌握好可以大大提升英语表达的准确性和流畅性。
首先，我们来看看 “however” 的基本用法。它可以放在句首、句中或句末，但使用时需要注意标点符号的搭配。当 “however” 放在句首时，后面通常需要加上逗号，以分隔两个独立的句子。例如：”I wanted to go for a walk, however, it started raining.” 当 “however” 放在句中时，前后都需要用逗号隔开。例如：”The task was difficult; however, she managed to complete it on time.” 如果 “however” 放在句末，则不需要加逗号。例如：”He decided to stay home, although he had planned to go out.”
除了这些基本用法，”however” 还可以与其他连词或副词搭配使用，以表达更复杂的转折关系。例如：”The movie was interesting; however, it was a bit too long.” 或者 “Despite the heavy rain, they continued with their picnic; however, they ended up getting soaked.”
通过这些例句，我们可以看到 “however” 的用法和位置是多样化的，但只要我们掌握了它的基本规则，就能轻松地在英语表达中运用自如。记住，多练习、多运用是关键！