He is always worrying about his son. worrying可以換成worried嗎?爲什

題目：

He is always worrying about his son. worrying可以換成worried嗎?爲什麼?

解答：

可以,worrying 是現在進行式動詞,換成worried後變成了形容詞.
He is always worrying about his son.他總是在擔心（動詞）他的兒子.
He is always worried about his son.他總是爲了兒子憂心忡忡（形容詞）.