tears谓语动词用单数还是复数？

tears应该是一个代称，指眼泪这一个大类，这样的一种大类都用is

谓语动词用单数的情况 1．动名词短语、不定式短语、名词性从句做主语，谓语用单数。如： Buying clothes is often a time-consuming job because those clothes that a person likes are rarely the cones that fit him or her. (1987年考研题) To understand the situation completely requires more thought than has been given thus far.
2．表示时间、距离、金额、重量、面积、体积、容积等度量的名词短语做主语时，谓语用单数。 Two weeks was too long Five times five makes twenty five
3．一般用and连接的两个单词或短语做主语时候，谓语用复数，但是下面用and连接的主语表示一个概念，谓语用单数： law and order 法制 soap and water 肥皂水 a cup and saucer 茶杯碟子 fork and knife 刀叉 the needle and thread 针线 trial and error 反复尝试，不断摸索 horse and carriage 马车 time and tide 岁月 bread and butter 奶油面包 the ebb and flow 盛衰，潮涨潮落 如： If law and order not preserved, neither the citizen nor his property is safe. A. is B. are C. was d. were 答案：A。
4．表示学科和某些疾病名称的名词是复数形式，作主语时候谓语动词用单数形式 Linguistics is a branch of study on human language. 5．有些名词形式上是复数，意义上是单数，根据意义一致原则动词用单数 The chaos was stopped by the police The news is a great encouragement to us A series of debates between the lectures was scheduled for the next weekend.
6．用and 连接的成份表示一个单一概念时候，动词谓语用单数形式 Bread and butter is our daily food Time and tide waits for no man《和3同》

这个时候应该去百度直接搜索：什么情况谓语动词用单数。。然后百度就会出来一大啪啦的讲解，其中百度文库一般都有总结，还会补充诸如什么情况谓语动词用复数。。。这就是学习方法了。。。而且百度有专门的学习老师坐镇。。你可以搜索 反正比。。专业。。你懂的~~

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