11．不定式、动名词或从句作主语时，谓语动词用单数。

　　How to solve the problem is to be discussed at the meeting.

　　如何解决这个问题要在会上讨论。

　　Whether he will help us with it doesn't matter too much.

　　他是否帮我们关系不大。

　　12．由"kind (form, type, sort, species, portion, series) of"等修饰的主语，其谓语形式取决于这些词的单复数而不是它们后面所跟的名词。

　　This new type of buses is now on show.

　　(Buses of this new kind are now on show.)

　　现在正展出一种新型的公共汽车。

　　All kinds of difficulties have to be overcome.

　　必须克服各种各样的困难。

　　A series of debates between the lecturers was scheduled for the next weekend.

　　讲师之间一系列的辩论安排在下周末举行。

　　13．a number of (许多)，a variety of (各种各样的)和a group of (一群，一组)修饰名词作主语时，谓语要求用复数形式。但是the number of (......的数目)和the variety of (......的种类)修饰名词作主语时，谓语用单数形式。试比较：

　　A number of students are from the south.

　　不少学生来自南方。

　　There are a variety of toys on sale in that shop.

　　那个商店出售各种各样的玩具。

　　The variety of goods on sale in that shop is surprising.

　　那个商店出售的货物品种多得惊人。

　　14．a quantity of后接复数名词作主语时，谓语动词用复数；a quantity of 后接不可数名词作主语时，谓语动词用单数；quantities of后接复数名词、不可数名词时，后面的谓语动词都用复数形式。

　　Great quantities of fish are caught in the deep sea.

　　在深海处抓了很多鱼。

　　There is a large quantity of milk.

　　有大量的牛奶。

　　15．"many a ＋单数名词"和"more than one ＋单数名词"作主语时，虽表示复数意义，但要遵循语法一致的原则， 谓语动词用单数。

　　Many a child was playing in the shade of the tree.

　　许多孩子在树荫下玩耍。

　　More than one student has passed the examination.

　　许多学生通过了考试。

　　5

　　(陕西高考改编)It is reported that many a new house is_being_built (build) at present in the disaster area.

　　16．表示单一概念的不定式、动名词或从句作主语时，谓语动词用单数。

　　Reading in the sun is bad for your eyes.

　　在阳光下读书对眼睛有害。