想当画家用英语怎么说

"想当画家"用英语可以表达为 "want to be a painter" 或 "aspire to be a painter".
"Want to be" 是一个常见的短语，意思是 "想要成为"。例如：
I want to be a doctor when I grow up. (我长大后想成为一名医生。)
He wants to be an astronaut. (他想成为一名宇航员。)
"Aspire to be" 也是一个常见的短语，意思是 "渴望成为"。例如：
She aspires to be a professional dancer. (她渴望成为一名职业舞蹈家。)
They aspire to be successful entrepreneurs. (他们渴望成为成功的企业家。)