现在完成时have/has + 过去分词。<br>用have还是has,要根据主语的人称来确定。<br>第一人称(I)<br>I have turned off the light.<br>第二人称(you单数)<br>You have turned off the light.<br>第二人称(you复数)<br>You have turned off the light.<br>第三人称(he/she/it)<br>He/ She/ It has turned off the light.<br>总结:第一人称,第二人称作主语时,用have。第三人称作主语时用has。<br>明白了吗。