‧給理由的重要句型：The main reason is that＋子句

解析3：除了用“because”來「給理由」之外，想拿高分的英文說法有：“The main reason is ＋ that ＋ 子句”（主要理由是……）。注意：我們在be動詞之後是用“that”而非“because”。

應用3.1：The main reason is that paper books would be forgotten and abandoned by children, because they may be far less attractive to them. (Ch1 1-1)（主要的原因是紙本書籍可能會被小孩遺忘或是遺棄，因為它們可能很不吸引孩子。《節選自Ch1 1-1》）

應用3.2：The main reason is that schools may not have as fundamental an influence as parents do. However, schools can help students who have difficult family situations. （主要理由是學校可能不如家長有根本的影響力。然而，學校可以幫助來自困難家庭的學生。）
    
‧給理由的重要句型：First of all、Firstly、First、In the first place（首先、第一點……）

解析4：在提供自己認為……的論點之後，你必須進一步解釋原因。第一點原因可用First of all、Firstly、 First、In the first place這些片語來起頭。

應用4.1：It would be dangerous if virtual materials replace printed books. First of all, children would lose interests in learning from paper books when they are obsessed by the abundant sound and visual effects of online materials. (Ch1 1-1)（首先，當孩子們著迷於網路材料豐富的聲光效果時，他們會失去從紙本書籍上學習的興趣。《節選自Ch1 1-1》）

應用4.2：I believe school education is much more important than family education. First of all, parents definitely have an impact on their children’s academic achievement. （我相信學校教育遠比家庭教育更重要。首先，父母親絕對能影響他們孩子的學術成就。）