“确信”造句

她有些不好接近,但我确信她想表现得友好一些。
She was somewhat unapproachable but I'm sure she wanted to be friendly.

“我确信我不知道。”库克一甩头说。
"I'm sure I don't know." Cook tossed her head.

确信医生和牙医最清楚该怎么做。
He was convinced that doctors and dentists knew best.