留学生想家时，可以用以下几种方式表达：

直接表达

"I really want to go home."

"I miss my family so much."

"I want to return home."

通过通讯联系

"I can call my family or chat online with them."

"I video call my parents whenever I can."

描述情感

"I feel so empty and homesick after a busy day."

"I miss the warmth of my home and my parents' cooking."

"I long to be back in my hometown, it feels like a longing in my heart."

强调回家的愿望

"I can't wait to go back home and see my family."

"I want to fly back to my home, it's my ultimate desire."

这些表达方式可以帮助留学生在不同情境下准确地传达他们的思乡之情。