ellip; 是必要的。it is necessary that s. (should) v.
　　…是重要的。it is important / essential that s (should) v.
　　…是适当的。it is proper that s. (should ) v.
　　…是紧急的。it is urgent that s. (should) v.
　　例如：我们保持公共场所的清洁是应当的。
　　it is proper that we (should) keep the public places clean.
　　(17) 每当我听到…,我就忍不住感到兴奋。
　　whenever i hear …, i can not but feel excited.
　　每当我做…, 我就忍不住感到悲伤。
　　whenever i do …, i can not but feel sad.
　　每当我想到…,我就忍不住感到紧张。
　　whenever i think of …, i can not but feel nervous.
　　每当我遭遇…,我就忍不住感到害怕。
　　whenever i meet with …, i can not but feel frightened.
　　每当我看到…,我就忍不住感到?取?/div>
　　whenever i see…,i can not but feel surprised.
　　例如：每当我想到我家附近那一条清澈的小溪，我就忍不住感到悲伤。
　　whenever i think of the clean brook near my house, i can not but feel sad.
　　=every time i think

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