16、世上沒有什么比…更令我高興。
Nothing in the world can delight me so much as …
例︰世上沒有什么比到快餐店吃漢堡更令我高興。
Nothing in the world can delight me so much as having hamburgers in fast-food restaurants.
17、… 是必要的 It is necessary that S （should）V
… 是重要的 It is important/essential that S （should）V
… 是適當?shù)?It is proper that S （should）V
… 是緊急的 It is urgent that S （should）V
例︰我們當保持公共場所清潔是應當?shù)摹?BR> It is proper that we （should） keep the public places clean.
18、每當我聽到…，我就忍不住感到興奮。Whenever I hear …，I cannot but feel excited.
每當我做…，我就忍不住感到悲傷。Whenever I do …，I cannot but feel sad.
每當我想到…，我就忍不住感到緊張。Whenever I think of …，I cannot but feel nervous.
每當我遭遇…，我就忍不住感到害怕。Whenever I meet with …，I cannot but feel frightened.
每當我看到… 我就忍不住感到驚訝。Whenever I see …，I cannot but feel surprised.
例︰每當我想到我家附近那一條清澈的小溪，我就忍不住感到悲傷。
Whenever I think of the clean brook near my home，I cannot but feel sad.
Every time I think of the clean brook near my home，I cannot help feeling sad.
Nothing in the world can delight me so much as …
例︰世上沒有什么比到快餐店吃漢堡更令我高興。
Nothing in the world can delight me so much as having hamburgers in fast-food restaurants.
17、… 是必要的 It is necessary that S （should）V
… 是重要的 It is important/essential that S （should）V
… 是適當?shù)?It is proper that S （should）V
… 是緊急的 It is urgent that S （should）V
例︰我們當保持公共場所清潔是應當?shù)摹?BR> It is proper that we （should） keep the public places clean.
18、每當我聽到…，我就忍不住感到興奮。Whenever I hear …，I cannot but feel excited.
每當我做…，我就忍不住感到悲傷。Whenever I do …，I cannot but feel sad.
每當我想到…，我就忍不住感到緊張。Whenever I think of …，I cannot but feel nervous.
每當我遭遇…，我就忍不住感到害怕。Whenever I meet with …，I cannot but feel frightened.
每當我看到… 我就忍不住感到驚訝。Whenever I see …，I cannot but feel surprised.
例︰每當我想到我家附近那一條清澈的小溪，我就忍不住感到悲傷。
Whenever I think of the clean brook near my home，I cannot but feel sad.
Every time I think of the clean brook near my home，I cannot help feeling sad.