Definition
This phrase is used to express that someone's actions or behaviors are predictable, especially in the context of making a foolish or typical mistake.
（某人）肯定會做這種蠢事！
Trust John to be the one to spill the coffee!
約翰肯定會把咖啡打翻！
Trust her to forget her wallet!
她肯定會忘記帶錢包！
Trust him to break something!
他肯定會弄壞東西！