start to do的用法和樣例：
例句
- When they first start working on something, they overrate their achievements.
當他們剛開(kāi)始做某一件事時(shí)，他們高估了自己的成就。 - David is a person who likes to do everything, and once he begins to do something, he never falls by the wayside.
大衛是一個(gè)喜歡什么都想試一試的人，一旦他開(kāi)始做某事，他就從不半途而廢。
