seriously和carefully用法的区别

有区别。

seriously在英语中是副词，表示“严重地，认真地”，可以用来修饰动词或者形容词 ，例如:He fell down from the car seriously.

carefully在英语中也是副词，表示“认真地，小心地”，可以用来修饰动词或者形容词，例如:He is finishing his homework carefully.