簡單的英文問題,, 麻煩幫忙

Question

Example：【原】It was helped. 【變】I helped it.
請問以下的這些題目有誰會：
1. Q They were frightened by bears.
2. Q the building was built by Mr.Chen.
Example：【原】I took this picture. 【變】The picture was taken by me.
請問以下的這個題目誰會：
Q The song made everyone happy.
忙煩幫幫忙~~=W=
順便告訴我以上第一種該如何去分別與解決!!
謝謝!!

Answer 1

Example：【原】It was helped. 【變】I helped it.
若你將這兩句翻成中文的話會變成：
【原】它被幫忙（它受到幫忙）　【變】我幫它
一個式被動式，另一個則是主動式。
所以下面這些題目可以用「中文」來理解題目^＿^
1. Q They were frightened by bears.
→這句的中文是：他們被熊嚇到。若改成主動的
則會變成熊嚇到他們（簡單的邏輯～）
所以主詞變成熊：bears，受詞就變成他們：they→them
---Ｂｅａｒｓ　ｆｒｉｇｈｔｅｄ　ｔｈｅｍ.（原題目為過去式）
第二題就應該可以自己寫吧^＿^
※提示：這首歌愉悅每個人→每個人被這首歌愉悅
以上～～～