当向他人说话用英语时，通常用短语 "speak to someone in Engpsh" 来表示。这个短语来自英语动词 "to speak" 和介词 "to" 的结合，表示向某人说话。
例句：
Can you speak to the customer in Engpsh? 能否用英语与客户交流？
I need to speak to the teacher in Engpsh about my grades. 我需要用英语与老师讨论我的成绩。
Do you feel comfortable speaking to people in Engpsh? 你感觉自己能用英语与他人交流吗？