agreatdealof后面名词加s还是没s?如果agreatdealof后面动词加s吗?anumberof后面名词加s吗

Question

a great deal of 后面名词加s 还是没s?如果a great deal of 后面动词加s吗?
a number of后面名词加s吗

Answer 1

a great deal of +不可数名词（充当主语时,属于第三人称单数,一般现在时的谓语动词加s或者es）：大量
如：
A great deal of money is spent on the books.
a number of+复数可数名词（加s或es）（充当主语时,是复数形式）
A number of students are in the classroom.
A number of students work hard.