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Father and mother are out shopping. Father and mother are out為系表結(jié)構(gòu)，shopping為現(xiàn)在分詞，理解為作目的或伴隨狀語均可。

Father and mother are shopping out. Father and mother are shopping.為進行時態(tài)，out是副詞，表示地點狀語。

第一句比較多見；第二句比較鮮見，若改為Father and mother are shopping out in the street. 為佳，說明不是在商店購物，而是在外面的大街上，形成對比。