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英語可說：I have free time. 但不說：I have a free time. 因為 time 表示“時間”時，是不可數名詞。名詞 time 的主要用法及可數性如下：

1. [U]時間：

Time flies. 光陰似箭。

Time will show which of us is right. 時間能證明咱們誰對誰錯。

2. [C,U]一段時間

She was away for quite a time. 她已經離開了相當一段時間。

3. [C]次，回

He comes late every time. 他每次都遲到。

This visit is very different from last time. 這次的訪問與上次大不一樣。

The baby woke up three times in the night. 孩子夜里醒了3次。

4. [C]倍

The new method was ten times more efficient than the traditional one. 新方法比傳統方法的效率提高了10倍。

5. (用單數)時機，機會：

There is a time for everything. 做事要當其時。

The best time to invest is now. 現在是投資的最佳時機。

6. (常用復數)時代，時期

The rising level of crime is a sign of the times. 犯罪率增高是這一時代的特征。