当你感到非常疲倦和疲劳时，可以用以下英语句子来形容自己的状态：
I am exhausted.
I am worn out.
I am tired to my bones.
I am weary in body and mind.
I am utterly exhausted.
I am dog-tired.
I am beat.
I am beyond tired.
I am so tired that I can't go on.
I am worn to a frazzle.
这些句子都可以表达你极度疲劳的状态，选择其中一句就可以啦。