have yet & have not ... yet

I have not done the homework yet或I have not yet done the homework.是常見句子，而I have yet done the homework.則未有所見
yet可解做”還，仍然”常用於疑問句或否定句，如：
Hasn't he come yet？（他還未來嗎？）
He has not yet finished his task（他還未完成任務）
但yet還可與have to連用，解：還得，如：
They have yet to make a decision(他們還得去下決定：意思即他們還未下決定）
所以，你第二句應改為：I have yet to do the homework.（我還得去做功課）與I have not yet done the homework.意思差不多
希望幫到你！