what在從句中作主語的例句

what在從句中作主語的例句：
What she saw frightened her.
她看到的事情嚇了她一跳。
What was once regarded as impossible has now become a reality.
曾經(jīng)被認(rèn)為不可能的事情，現(xiàn)在已經(jīng)變成了事實(shí)。