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關閉窗口 （三）動名詞作表語和進行時態的區別
“動名詞作表語”和“進行時態”形似而神異。請看這兩個句子：She is looking after the children.和Her job is looking after the children. 它們太相似了，只是主語不同，其他成分完全一樣，意思卻大相徑庭，這是為什么？
這確實是一個很有意思的問題。Her job is looking after the children. 意為 “她的工作是照料孩子的。” 本句中，is 是系動詞，looking after the children是動名詞作表語。因為is是系動詞，主語和表語是平等的并列關系，所以，主語和表語可以互換而意思保持不變：Looking after the children is her job. 照料孩子是她的工作。
She is looking after the children. 意為“她正在照料孩子。”本句中，is是助動詞，跟動詞look的現在分詞構成進行時態，所以is前后兩部分不能互換。不可說：*Looking after the children is she. 又如：
His hobby is collecting stamps. 他的業余愛好是集郵。
→Collecting stamps is his hobby.
He is collecting stamps. 他正在集郵。
不可說：* Collecting stamps is he.
His ambition is working as a lawyer. 他的抱負是當律師。
→Working as a lawyer is his ambition.
He is working as a lawyer. 他正在以律師的身份工作著。
不可說：*Working as a lawyer is he.
【規律】A代表“主語”，B代表“動詞-ing形式”：
“主系表結構”：A is B. 可以說：B is A. （is意為“是”）
“進行時態”：A is B. 不可以說：B is A. （is doing意為“正在做”）
請區別以下例句中，哪些是動名詞作表語的例句，哪些是進行時態的例句。
His hobby is collecting stamps. 他的業余愛好是集郵。
His ambition is working as a lawyer. 他的抱負是當律師。
The only way to cure your disease is going to bed. 治療你的病的唯一辦法是上床睡覺。
Her job is keeping the offices clean. 她的工作是給辦公室保潔。
Her work is teaching children music. 她的工作是教孩子音樂。
His only wish is finding a job in an office. 他唯一的愿望就是找一份辦公室的工作。
The ant queen’s full-time job is laying eggs. 蟻后的專職工作是產卵。
The boy’s interest is playing games online. 這個男孩的興趣就是玩網上游戲。
My favourite sport is playing tennis. 我最喜歡的運動是打網球。
Her first delight was going to the Tower. 她第一個想做的事情是參觀倫敦塔。
The scientist is doing experiments no one has so far attempted. 科學家正在作一項迄今為止沒人做過的實驗。
According to these figures, our company is doing well. 從這些數字來看，我們的公司經營得不錯。
The teacher is reading Tom’s English paper. 老師正在審閱湯姆的英語答卷。
He always makes careful notes while he is reading. 當他閱讀時，他總是仔細作筆記。
The witness was telling about the whole accident. 目擊者正在講述整個事故的過程。
He is working in his photographic studio. 他正在攝影室工作。
The sculptor is working on a sculpture of Venus. 那個雕刻家正在雕一個維納斯雕像。
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