Iwhoyour friend
I,who__your friend,will never lie to you.I,who__your friend,will never lie to you. A is B are C am Dbe 为什么选C不选A 我的第一感觉也是A~啊 为什么
who 代替的是I,实际上原句还是i am your friend,的变形. 另外强调句中也有这样的怪题: today it is you who have come earlier.have不用 has 更怪的是主语的I,HE也不能改成宾格: it is I who am waiting for your answer. it is he/she/they/we who is/is/are/arewaiting for you. 注意里面的人称与数的一致.
定语从句,和它的主语保持一致,所以这里应该和I 保持一致,那就是am.