我太累了,i am too tired.为什么用am?tired是什么词性?

我太累了,i am too tired.为什么用am?tired是什么词性? i am too tired to fall asleep. 到底是太累了睡着了,还是太累了睡不着. 1,I am very tired,为什么用tired? I am too tired to (walk还是walking) 为什么? i am _ _ _ tired.我有一点累了 i am tired ,too(改为否定句) i am too tired ____(work) on I am too tired to say anything. i am tired .she tired i am too tired to work no longer 改同义句 i am----tired ---- i c He is tired .And I am tired,too改为同义句.He is ()()() I am Boy am I tired 是什么结构