你好,yet通常用在疑问句或否定句中,其中包含宾语从句中引导的疑问句或否定句,比如Hesaidhehadn'tfinishedhishomeworkyet. Hesaidifyouhavedoneyourhomeworkyet.而在肯定句中,通常使用already。Ihavealreadyfinishedmywork.希望你满意哦^_^