As an expert in linguistics and language usage, I'm here to provide a comprehensive answer to your question regarding the use of "is" versus "does" in English grammar. Understanding when to use these auxiliary verbs is crucial for clear communication and can sometimes be confusing for learners of English.
Firstly, let's define "is" and "does." "Is" is a form of the verb "to be," which is used to describe identity, state, or existence. "Does," on the other hand, is the third person singular form of the auxiliary verb "do," which is used to form questions and negatives in the simple present and past tenses, as well as to add emphasis in the present simple tense.

Now, let's delve into the use of "is" and "does" in sentences:


1. Use of "is":
- "Is" is used when the subject of the sentence is singular. For example, "He is a doctor."
- It is also used to link the subject with a noun or an adjective to describe identity or state. For instance, "The sky is blue."


2. Use of "does":
- "Does" is used to form questions when the subject is third person singular (he, she, it, or a singular noun). For example, "Does she do her homework every day?"
- It is also used to form negatives in the simple present tense with third person singular subjects. For example, "He does not like coffee."
- "Does" can be used to add emphasis in the present simple tense. For example, "She certainly does know the answer."

The reference you provided hints at a scenario where the subject changes from singular to plural, and the verb form must adjust accordingly. This is an important point to consider. When the subject of a sentence is singular, "is" is the correct form of the verb "to be" to use. However, when the subject is plural, the verb "to be" changes to "are." For example:
- Singular: "The team is ready."
- Plural: "The team members are ready."

In contrast, "does" and "do" are used with plural subjects when forming questions or negatives in the simple present tense. For example:
- Plural question: "Do the team members do their exercises every morning?"
- Plural negative: "The team members do not do their exercises every morning."

It's important to note that "does" and "do" are auxiliary verbs and are often used with the base form of the main verb in a sentence. "Is" is a linking verb and does not take a base form of another verb but rather links the subject with a noun or adjective.

In conclusion, the use of "is" or "does" depends on the subject of the sentence and the tense you are using. "Is" is used with singular subjects and to describe identity or state, while "does" is used with third person singular subjects to form questions and negatives in the simple present and past tenses, and to add emphasis.

Now, let's move on to the translation of the above explanation into Chinese.

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Although in both cases the verb "connect" is being used, in the first case the subject being discussed is singular and in the second the two part subject is, considered as a whole, plural. ... When switching from a singular to a plural subject, the helping verb does need to change.Jun 20, 2011read more >>