1、For和since在现在完成时中的用法区别点时间和段时间5:305years3minutes2002May52months点时间段时间段时间点时间点时间段时间since:(自…以来)1)since+过去的时间点He has stayed heresince 5 o’clockyesterday.2)since+时间段+agoHe has stayed heresince 5 hours ago.3)since+从句(动词用过去时)She has taught Englishsince he came her