1000-hours/sounds-of-american-english/3.2.13-wj.md
<span class="pho">w</span> 和 <span class="pho">j</span> 是半元音。
<span class="pho">w</span> 与后面的元音相连,相当于在那个元音前面加上了一个 <span class="pho">ʊ</span>,比如 way <span class="pho">weɪ</span><span class="speak-word-inline" data-audio-us-male="/audios/way-us-male.mp3" data-audio-us-female="/audios/way-us-female.mp3"></span>,读音上相当于是 <span class="pho">ʊeɪ</span>。
<span class="pho">j</span> 与后面的元音相连,相当于在那个元音前面加上了一个 <span class="pho">ɪ</span>,比如 you <span class="pho alt">juː</span><span class="speak-word-inline" data-audio-us-male="/audios/you-us-male.mp3" data-audio-us-female="/audios/you-us-female.mp3"></span>,读音上相当于是 <span class="pho alt">iuː</span>。
<span class="pho">w</span> 可以和另外的辅音结合作为音节开头:<span class="pho">sw</span>、<span class="pho">tw</span>、<span class="pho">dw</span>、<span class="pho">kw</span>、<span class="pho">skw</span>、<span class="pho">gw</span>…… 这其中最容易出错也最常的是 <span class="pho">kw</span>,尤其是 <span class="pho">kwɒ</span> 和 <span class="pho">kwɔː</span>,比如,quart <span class="pho alt">kwɔːrt</span><span class="speak-word-inline" data-audio-us-male="/audios/quart-us-male.mp3" data-audio-us-female="/audios/quart-us-female.mp3"></span>,常常会被误读为 <span class="pho alt">kɔːrt</span>(听起来和 court <span class="pho alt">kɔːrt</span><span class="speak-word-inline" data-audio-us-male="/audios/court-us-male.mp3" data-audio-us-female="/audios/court-us-female.mp3"></span> 同音);再比如,quality <span class="pho alt">ˈkwɑː.lə.t̬i</span><span class="speak-word-inline" data-audio-us-male="/audios/quality-us-male.mp3" data-audio-us-female="/audios/quality-us-female.mp3"></span> 常常会被误读为 <span class="pho alt">ˈkɔːlɪti</span> —— 关键在于,<span class="pho">k</span> 的音之后有一个发出 <span class="pho">ʊ</span> 的嘴唇动作,否则 <span class="pho">kw</span> 就变成了 <span class="pho">k</span> —— 这个差异在母语使用者听起来异常地明显。