They were casually dressed; possibly students.
他们穿着随意，可能是学生。
"You can't possibly use this word."—"So I won't."
“你不可能会用这个词。”—“我确实不会用。”
They've done everything they can possibly think of.
凡是可能想得到的，他们都已经做了。
No one could possibly take exception to his comments.
任何人都不可能对他的意见提出异议。
Suddenly it dawned on me that they couldn't possibly have met before.
我突然明白他们以前不可能见过面。