Know for a certainty that...
确实知道...
🧩 词语组成解析
know
[no]
v. 知道;了解;认识;确信;
n. 知情;
for
[fɚ]
prep. 为，为了;倾向于;关于;当作;
conj. 因为，由于;
🗣️ 情景例句
John cannot get to the phone right now.
John现在没办法接电话。
I would not waste my time pursuing that.
如果是我的话，不会将时间浪费在这里。
He's putting on his school clothes.
他在穿校服。