因没有主动打招呼而向朋友道歉的英语句子可以是：

1. "I apologize to my friends for not greeting them."

2. "Please forgive me for not saying hello to you."

3. "I'm sorry for not greeting you earlier."

4. "I regret not saying hello to you and hope you can forgive me."

5. "I'm really sorry for not greeting you, it was thoughtless of me."