为什么这句话里的smile要加s?a man cannot smile like a child,for a child smiles with his eyes,while a man smiles with his lips alone.为什么第一个smile不加s,而后面两个要加呢?求学霸或老师解惑.

为什么这句话里的smile要加s?a man cannot smile like a child,for a child smiles with his eyes,while a man smiles with his lips alone.为什么第一个smile不加s,而后面两个要加呢?求学霸或老师解惑. 这句话mean加s对不对的?All the happiness and joy means nothing to me without your smile这句话mean加s对不对的?All the happiness and joy means nothing to me without your smile. 不管对不对说个理由.为什么要加s,或为什么不 a smile costs nothing,but gives so much 为什么cost要加s?先不看give加s A pair of comedians entertains the audience这句话里动词A pair of comedians entertains the audience这句话里动词entertain为什么要加s?前面的主语不是复数吗? a smile express joy 前面为什么要加一个a she lies smiling and i love her smiles为什么前边smile去e加ing,后边的smile加s 第三人称单数动词要加s但为什么这句话里的动词不用加?Can she type this letter for me?she是第三人称但为什么其后面的动词type不用加S? 将下面这句话改成一般疑问句Amy's got a new dress.还有就是为什么句子里的“Amy’s”里有“is”,为什么要这样用? 这句话为什么要加been啊 there's obviously just been a little mistake. I'm really glad to see you请问这句话后面的see为什么还是动词原形?be后面的动词不是要加ing的吗?还有It's a pleasure to meet you也是 You visit yourgrandmother on Sundays. Sundays这里的“s”为什么要加,如果不加“s”,这句话对吗? I like to watch DVDs .这个DVD后面为什么要加s?我知道是DVD的复数形式,但是在这句话里why? it's the typical satisfied smile of a mother to be这句话怎么翻译 String sql=update student set sname='+name+',ssex='+sex+where sid=+sid这句话里的sid和sname这句话里的sid和sname和ssex是什么意思?为什么要加s? i always watch cartoons.这句话里后面一个单词为什么加S 英语这句话里consider为什么加s?Xiaoqiang always considers it difficult to travel alone. I'm afriaid of being late.这句话里为什么加个being?它是什么用法? Start each day with a smile.It's a good way to begin a day with!这句话的中文怎样翻译