suī / rán / wǒ / rèn / shi / zhè / ge / zì / dàn / yì / tí / bǐ / jiù / wàng / le / zěn / me / xiě / zhēn / shi / tí / bǐ / wàng / zì

虽然我认识这个字，但一提笔就忘了怎么写，真是提笔忘字。

Although I recognize this character, I forget how to write it as soon as I pick up a pen.