那是的用法和樣例：
例句
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那是一段艱難的日子。
That was a hard time. -
我喜歡回顧我的中學時代，那是我生命中最快樂的時光。
I like to look back on my high-school days, which were the happiest in my life. -
電視台為出現的干擾表示歉意，那是由於惡劣的天氣狀況造成的。
The television station apologized for the interference, which was due to bad weather conditions. -
那是一個以幾種語言敘述的古老的故事。
It's an ancient tale which appears in various guises in several languages. -
那是我的兩個兒子。你能猜出哪個大嗎？
There go my two sons. Can you guess which is the elder?
