When we make a sentence, someting that must be taken notice is AN AGREEMENT where the verb agrees at the subject in Number and Person. What we usually find is when two or more singluar subjects connected by, the verb usually take a plural form.
For examples:
Andi and Tina go together.
The verb /go/ agrees at /Andi and Tina/. It is because there are two persons in /Andi and Tina/ which is combined by a conjunction /and/. This will be different when the sentence is like this below!
Andi or Tina doesn't have the same thought in that problem.
When the conjunction /or/ is used, the existance of /Andi/ becomes one as well as Tina. Here, /or/ has separated both subject into singular. Therefore, an auxilliary /does/ is used to indicate that the subject is in singular.
Let's take notice when the sentence is changed into Positive!
Andi or Tina has the same thought in that problem.
As you know that the verb /have/ must be correlated to subject /I/, /you/, /we/ or /they/ and the verb /has/ must be with /He/, /she/ or /it/. Placing has in that sentence states that the subject is in singular, not in plural.
For examples:
Andi and Tina go together.
The verb /go/ agrees at /Andi and Tina/. It is because there are two persons in /Andi and Tina/ which is combined by a conjunction /and/. This will be different when the sentence is like this below!
Andi or Tina doesn't have the same thought in that problem.
When the conjunction /or/ is used, the existance of /Andi/ becomes one as well as Tina. Here, /or/ has separated both subject into singular. Therefore, an auxilliary /does/ is used to indicate that the subject is in singular.
Let's take notice when the sentence is changed into Positive!
Andi or Tina has the same thought in that problem.
As you know that the verb /have/ must be correlated to subject /I/, /you/, /we/ or /they/ and the verb /has/ must be with /He/, /she/ or /it/. Placing has in that sentence states that the subject is in singular, not in plural.
Besides, there are several agreements that should be learnt in English, they are;
a)When subject express one or similiar Idea.
For example:
Life or death is misterious.
/Life/ is the opposite of /death/. But they have the same idea in /misterious/.
b)Subject which has a quantifier
For example:
Every children needs to care.
Each of the members is retired.
One of the students plays truant.
/Every/ is quantifier for /children/. therefore, the verb must be in singular form /need ---> needs/.
c)A collective noun
For example:
The committee has decided the next program.
/The committee/ is a collective noun where there are many persons as its members but has been united into one group. We do not count the members but the group /committee/. Here, committee is in singular form.
d)Nouns looks plural but singular in meaning
For example:
Politics doesn't mention what you want but mentions what it requires.
/politics/ looks plural but it has singular in meaning. Therefore, the auxilliary must be /does/ and we place /-s/ behind the verb /mention/ and /require/ as the agreement.