用“However，…”作为开头，引出一个与上一个句子矛盾或形成对比的句子，这样就会提醒读者即将迎来一个转变。在“However”后面一定要加逗号，然后跟上一个完整的句子。  你可以这样写：“I was very excited to be invited to lunch. However, I had already made plans.（我很高兴能被邀请吃午饭。但是，我已经另有打算。）” 另一个例子是，“The pattern was certainly original. However, the new wallpaper did not match the furniture at all.（图案当然是原创的。但是，新墙纸和家具一点都不搭。）” 当你有两个完整的句子相互对立或形成对比，但又紧密相连时，用分号、“however”和逗号将它们连接起来。这表明第二句话在某种程度上与第一句相反。  从含义相反的两句话开始：“I would love to join you for lunch. I am too busy.（我愿意和你一起吃午饭。我太忙了。）” 用这种方式连接这两句话：“I would love to join you for lunch; however, I am too busy.（我愿意和你一起吃午饭。但是，我太忙了。）” 这样就会使句子之间的联系更加紧密，有助于使你的写作读起来更有聚合力。 要打断一个正在进行的句子，在两个逗号之间插入“however”。就像“however”的其他用法一样，这样就暗示了与前面内容的对比，但是这种对比的重要性在一定程度上有所削弱。  在第二句的主语后面加上“, however,”：“I can't make it to lunch. You, however, are going to love that restaurant.（我不能去吃午饭了。不过你会爱上这家餐厅的。）” 使用它来分隔双动词：“I can't make it to lunch. I could, however, join you next week.（我不能去吃午饭了。不过我下周可以和你一起去。）” 把它放在第二句的末尾：“I can't make it to lunch. I could join you next week, however.（我不能去吃午饭了。不过我下周可以和你一起去。）”
用“However”作为一个对比语句的开头。 用“; however,”连接两个对比语句。 用“, however,”作为题外话。
用“However”作为一个对比语句的开头。 用“; however,”连接两个对比语句。 用“, however,”作为题外话。