when同while 問題

[過去] 或 [現在]，甚至 [進行]，不能單憑 [when] 或 [while] 來次定，而是根據 [動詞] 的 [時式]。
e.g.
(1) My parents were having dinner when I got home. (一邊是 [過去進行]， 一邊是 [過去])。
(2) While he is busy talking, I am busy eating. (兩邊都是 [現在進行])。
(3) When he was talking, I ate all the food. (一邊是 [過去進行]， 一邊是 [過去])。

不過，如果不用 [進行式動詞]，單憑 [when] 和 [while]， [when] 是指某一個時點 (certain point in time)，而 [while] 指一個時段 (a period of time)，所以有 [進行] 的感覺。

例如：
(1) "he danced while I sang' 和 "he dances while I sing" 都有着两邊當時都同時進行的意思。
(2) "he danced when I sang" 和 "he dances when I sing" 感覺上他可能只在我唱歌的時段中跳過舞。

由於 [while] 有進行的意思，所以比較適用於放在進行式前面 (即是 [進行]中的那一邊)。
e.g.
While I was taking a bath, the phone rang.
The phone rings while I am taking a bath.

相對來說，由於 [when] 有[時點] (point in time) 的意思，所以比較適用於放在簡單 [現在] 或 [過去] 式前面 (即是 [不是進行]中的那一邊)。
e.g.
When the phone rang, I was taking a bath.
I am taking a bath when the phone rings.

如果兩邊都同時進行，[while] 比較好些。
e.g.
(1) She was singing while taking a bath.
(2) The phone was ringing nonstop while she was taking a bath.

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when係現在 also when係進行

while 係進行

When you realize that you must study for the exam, it will be too late. (現在(future))

When I was born, I was 10kg. (進行(past))

I was doing my homework while talking on the phone with my girlfriend.(進行(Now)

WHEN = 當 asking: 可時

例子: When you asked me about...
When are you comeing back?


WHILE = 一會兒,一段時間

例子: While you were defrosting the meat, I was preparing the seasonings.