我有一个弟弟英语怎么说

"I have a younger brother" in English can be translated as "我有一个弟弟". The origin of the phrase is from the English language, where "I have" is a common way to express ownership or possession of something.

Example sentences in English with Chinese translation:

"I have a younger brother who is 12 years old." - "我有一个12岁的弟弟。"
"I have a younger brother and a younger sister." - "我有一个弟弟和一个妹妹。"
"My younger brother is my best friend." - "我的弟弟是我最好的朋友。"