Definition
Used to express advice or to issue a warning or threat.
最好是…（建議或警告）
You had better submit the report to me before the meeting starts.
你最好在會議開始前把報告交給我。
They had better start preparing now, or it will be too late.
他們最好現在就開始準備，否則就太遲了。
You had better not make the same mistake again.
你最好不要再犯同樣的錯誤。