it's這是一個縮寫，所以要把it's改成否定要看it's究竟是哪兩個單詞的縮寫。

絕大部分情況下，it's是it is的縮寫，如：It's a sweet apple. 這句話中It's是it is的縮寫，所以這句句子改成否定句應該是It isn't a sweet apple.

It's也可以是It has的縮寫，如：It's been three years.這句話中的否定就是It hasn't been three years.

要在系動詞後面加上否定前綴，就是it is not，就是it's的否定形式。

is it縮寫讀法

is it連讀發音技巧：前有s,所以it的i被濁化,聽上去就是i zi t。注意i很短促，zi往上揚，t也只是稍微發出聲音。

1. . Is + it = izit Is it cold in Australia at the moment? [izit] 現在在澳洲冷嗎? No, it’s warm.

2. . Does + it = doezit Does it ever snow in Australia? [doezit] 在澳洲會不會下雪? Yes, but only in winter.

3. . Was + it = wazit I just came back from Australia?

英語連讀發音技巧：輔音＋元音（A,E,I,O,U）一句話中相鄰的兩個單詞，前一個單詞以輔音結尾，後一個單詞以元音開頭。1. Take it easy 連讀形式：ta(k-it-ea)sy；2.not at all 連讀形式：no(t-a t-all)。

isn't 英[ˈɪznt] 美[ˈɪzənt]

is not 的常用口語形式。

It's past the appointed time. Maybe he isn't coming.

約定的時間都過了，別是他不來了吧