"Eating breakfast at that time is really fun" 可以用英文表示为 "Having breakfast at that time is really enjoyable" 。
"Enjoyable" 是形容词，意思是令人愉快的、有趣的。"Having" 是动名词，表示正在进行某个动作。
例句：
Having breakfast with my family on weekends is really enjoyable.
在周末和我的家人一起吃早饭真有意思。
I find having breakfast in the park to be very enjoyable.
我觉得在公园里吃早饭很有意思。
Eating breakfast at a cozy café is always enjoyable.
在舒适的咖啡馆吃早饭总是令人愉快。