study的過(guò)去式和過(guò)去分詞？

　　study 雙語(yǔ)例句

　　例句 1. Reading for pleasure and reading for study are not the same.

　　讀書以自?shī)屎妥x書以學(xué)習(xí)是不相同的。

　　例句 2. We will study the report carefully before making a decision.

　　我們將認(rèn)真研究這份報(bào)告，然后再作決定。

　　例句 3. They studied the geographical distribution of the disease.

　　他們研究了這種疾病的地域分布情況。