i am tired now.为何这里用过去式

i am tired now.为何这里用过去式 I am now very happy but tired中文是什么意思 I want to die,i am tired,really tired.（Do not to believe anyone from now 有关BE+adj某人刚下飞机很劳累说了这样一句话i am a little tired ,tired是adj,这里为什么用tired而不用tire i am really tired.用一般过去时 I am tired . I am tired of My sister is taller than I am.这里为何要用I am?可不可以把am去掉? I am so tired that I can fall asleep right now 句中的 so 译 I am really tired tired .如题 我太累了,i am too tired.为什么用am?tired是什么词性? I am tired b()I am happy. i am so tired 意思 I am tired ( ) happy today. So tired,am i escaping? Officially,I am so tired. Officially,I am so tired. I am tired of life!