這里的“單獨(dú)一個(gè)人”可以有兩種說(shuō)法：alone或by herself.alone作為副詞使用.
"大賣(mài)場(chǎng)"可以譯為hypermarket,supermarket,shopping mall等等.
整句話可譯為：
My mother often goes to the hypermarket by herself.But now she is shopping with my cousin!
或
My mother often goes to the hypermarket alone.But now she is shopping with my cousin!