在周日上午怎么说英语

To say "Sunday morning" in English, you can simply say "Sunday morning."
For example:
"I like to go for a walk on Sunday morning."
"Sunday morning is my favorite time to sleep in."
"I usually have breakfast with my family on Sunday morning."
You can also use the word "Sunday" as an adjective to describe something that happens on Sunday morning. For example:
"I have a Sunday morning yoga class at the park."
"Sunday morning is the best time to go grocery shopping because the store is less crowded."