"two years ago "不是表过去时吗?为什么可以与现在完成时连用?(since two years ago)而when就不可以?

two years ago 不是表过去时吗?为什么可以与现在完成时连用?(since two years ago)而when就不可以? since two years ago 中但是ago不是标志过去式吗?不矛盾吗这个句子不矛盾吗? SINCE TWO YEARS AGO的同义句 two years ago英语作文,六句话 I am taller than two years ago. two years ago 用什么提问 I was taller than two years ago accident,took,two,ago,the,place,years His grandpa____(die)two years ago Two years ago.about i love you. she left this area two years ago同义句she( ) ( )( )( )this area ( )two years ago Her aunt started to play the guitar two years ago.对two years ago进行提问 My brother went aborad two years ago.(改为同义句)My brother_____ ______aborad two years ago. two years ago,he left for the last time改为同义句two years ago,he______ The helping program started two years ago.two years ago划线部分提问.急! I was a child two years ago.划two years ago When did you study in france?A,Two years ago B,Since two years ago She bought the car two years ago.对two years ago提问