英语现在完成时中，什么时候用had？

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

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