第333期:studied還是had studied?_初級(jí)英語(yǔ)口語(yǔ)

By the time he was 14 years old, he studied advanced mathematics all by himself. 他在14歲時(shí)，已經(jīng)開始自學(xué)高等數(shù)學(xué)了。

這個(gè)句子中有一個(gè)從句，它包含一個(gè)充當(dāng)時(shí)間狀語(yǔ)的介詞短語(yǔ)中。我們要說(shuō)的這個(gè)介詞短語(yǔ)是by the time，它的意思是“到......為止”，那么后面緊跟了一個(gè)從句：he was 14 years old。

By the time he was 14 years old是說(shuō)到他十四歲為止，換句話說(shuō)就是十四歲之前，他就開始自學(xué)advanced mathematics了。

我們注意這個(gè)從句使用的時(shí)態(tài)是一般過(guò)去時(shí)：was 14 years old。而study advanced mathematics這件事情發(fā)生于14歲之前，也就說(shuō)是在14歲之前這個(gè)時(shí)間就已經(jīng)發(fā)生了的事情，要么就在這里就要用過(guò)去完成時(shí)了，應(yīng)該是：had studied mathematics。

因此，我們今天分析的病句的正確表述為：By the time he was 14 years old, he had studied advanced mathematics all by himself.