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Let's look at a simple example: the modal verb "can". When we use the positive form of "can" we quickly glide over the can and it is hardly pronounced.
舉個簡單的例子，我們用肯定式的"can"的時候，會很簡單的滑過這個詞，"can"幾乎不發音。
They can come on Friday . (stressed words underlined)
他們周五能來。（有下劃線的單詞應該重讀。）
On the other hand, when we use the negative form "can't" we tend to stress the fact that it is the negative form by also stressing "can't".
而當我們用否定的"can't"的時候，我們會加強否定語氣。于是重讀的單詞就變成了：
They can't come on Friday .
他們周五不能來。
As you can see from the above example the sentence, "They can't come on Friday" is longer than "They can come on Friday" because both the modal "can't" and the verb "come" are stressed.
所以大家就知道，上面的例句中，"They can't come on Friday"說起來就比"They can come on Friday"要長了。因為"can't"和"come"都重讀了。
