This is Everyday Grammar. I'm Lucija. And I'm Kaveh.
欢迎收看《每日语法》，我是露西佳。我是卡维。
As you may know, subjects and verbs must agree in number.
你们可能知道，主语和动词必须保持数的一致性。
If the subject is plural, its verb is plural as well.
如果主语是复数，动词也要是复数形式，
You wouldn't say: "The dog are friendly." But, "The dog is friendly."
你不会说：The dog are friendly.（错误用法），但可以说：The dog is friendly.（这条狗很友好。），
Because"dog" is singular, so the verb also needs to be singular.
因为dog在这里是单数，因此动词也需要使用单数形式。
This is what we call SUBJECT-VERB AGREEMENT. And in general it's not difficult.
这就是我们所说的主谓一致，总体来说不是很难。

But sometimes subjects are complex. And sometimes they are separated from their verbs.
但有时候主语很复杂，有时候他们和动词是分开的，
These situations can make SUBJECT-VERB AGREEMENT even more difficult to understand.
诸如此类的情况会让主谓一致更难理解。
Collective nouns, like committee, staff, family, crew, talk about multiple people,
如committee/staff/family/crew这类集体名词论及很多人，
but these nouns are grammatically singular in American English.
但在美式英语中，这些名词从语法上来看是单数形式，例如：
My family is here.
我的家人到了。
The staff is ready for the presentation.
工作人员已准备好做演示了。
Country names, even if they end with an –s are usually singular.
国家名称，即便是以s结尾，通常也表示单数，例如：
The Philippines is a beautiful country.
菲律宾这个国家漂亮。
The Netherlands is known for tulips.
荷兰以郁金香闻名。
A compound subject is two or more individual nouns connected into a larger noun phrase.
复合主语是由两个或两个以上个体名词连接构成一个更大的名词短语。
When you have two or more subjects connected by "and" use a plural verb.
如果由and连接两个或两个以上主语时，动词用复数，
If singular subjects are connected with "or", then use a singular verb.
如果是由or连接的单数主语，谓语用单数动词，
Just remember, SUBJECT-VERB AGREEMENT is the foundation of grammar.
只要记住，主谓一致是语法的基础。