我通常在家吃午饭用英语怎么说

"I usually eat lunch at home" 是一种常见的表达方式。
其中 "eat lunch" 是固定短语，意思是 "吃午饭"；"at home" 是副词，意思是 "在家"。
例句：
I usually eat lunch at home. (我通常在家吃午饭。)
He prefers to eat lunch at home. (他喜欢在家吃午饭。)
She never eats lunch at home. (她从不在家吃午饭。)
"Eat lunch" 和 "at home" 是可以替换为其他词的，如 "have lunch" 和 "in the office"，分别表示 "吃午饭" 和 "在办公室"。