在什麼情況下能用到 how come?

母語人士的回答
Rebecca
how come 是一種詢問原因的口語講法,指為什麼、怎麼會。在這裡,是問為什麼變成了自己根本不喜歡的模樣。 例句: How come you left the party early? = Why did you leave the party early? (為什麼你提早離開派對了?) 例句: A: I won't be coming this weekend. (我這週末不會過來。) B: How come? (為什麼?) A: I have another doctor's appointment. (我又要去看醫生。) 例句: How come people are so kind here? (這裡的人怎麼會如此親切?)