在英语中，当你玩玩具而感到开心时，你可以说：

"I'm having fun playing with my toys."

这句话的来源是由 "have fun" 这个短语和 "play" 这个动词组成的。"Have fun" 意思是 "玩得开心"，"play" 意思是 "玩"。

下面是一些关于玩玩具开心的英文例句，并附上中文翻译：

"I love playing with my dolls. It's so much fun!"
("我喜欢玩娃娃。真是太有趣了！")

"Playing with toy cars is one of my favorite things to do."
("玩玩具车是我最喜欢做的事之一。")

"I can't stop smipng when I'm playing with my stuffed animal."
("当我玩填充玩具动物时，我忍不住笑容满面。")

"Playing with my LEGO set always puts me in a good mood."
("玩乐高积木总是能让我心情愉快。")