zhège duì yǒu hěnduō rén.

Yes, 队 is the noun team. The 个 is a measure word / classifier used after 这 when pointing to a noun.

The pattern is:

这 + measure word + noun

So:

• 这个人 = this person
• 这本书 = this book
• 这个队 = this team

Even though 个 is the most common general classifier, some nouns also have more specific classifiers. For 队, you may also hear more specific forms in some contexts, but 这个队 is very normal and easy for learners to use.

Because 有 means to have or there is/are, while 是 means to be.

In this sentence, the idea is that the team has many people:

• 这个队有很多人。 = This team has many people.

If you used 是, it would not express possession or existence correctly here.

A helpful pattern is:

A 有 B = A has B

So here:

• 这个队 = this team
• 有 = has
• 很多人 = many people

In modern Mandarin, 很多 usually just means many / a lot of.

Even though 很 often means very, in 很多 the combination functions as a common quantity expression meaning many.

So:

• 很多人 = many people
• 很多书 = many books
• 很多事 = many things

Learners often try to analyze it as very + many, but it is best to learn 很多 as one common chunk meaning many / a lot of.

Because 很多 directly modifies the noun as a quantity expression. In Mandarin, quantity words like this usually go straight before the noun without 的.

So:

• 很多人 = many people
• 很多书 = many books

This is normal.

Using 的 here would usually sound unnatural or change the structure.

A simple rule:

• demonstratives + classifiers + nouns: no 的
• numbers/quantities + nouns: usually no 的

Mandarin nouns usually do not change form for singular vs. plural the way English nouns do.

So 人 can mean:

• person
• people

The meaning is understood from context or from words around it.

Here, 很多 tells you it must be plural in meaning:

• 很多人 = many people

Also, you cannot say 很多人们 here. After a number or quantity word like 很多, Mandarin normally uses the plain noun, not 们.

The pattern is:

subject + 有 + quantity + noun

So this sentence breaks down as:

• 这个队 = this team
• 有 = has
• 很多人 = many people

Together:

这个队有很多人。

You can use the same pattern in many other sentences:

• 这个学校有很多学生。 = This school has many students.
• 我家有五口人。 = My family has five people.
• 公司有很多员工。 = The company has many employees.

Not as the standard full sentence for this meaning.

The natural basic sentence is:

这个队有很多人。

If you want a version without 有, a more natural structure would be:

这个队人很多。

That means something like:

• This team has a lot of people.
• There are a lot of people on this team.

So:

• 这个队有很多人。 = fully standard and straightforward
• 这个队人很多。 = also natural
• 这个队很多人。 = usually not the best choice

Usually, in this sentence, people will understand it as the team has many members / there are many people in the team.

However, 人 by itself is a general word meaning people, so the sentence does not explicitly say members. It relies on common sense and context.

If you want to be more specific, you could say things like:

• 这个队有很多队员。 = This team has many team members/players.

So 人 is correct, but 队员 is more precise.

In normal speech, 这个 is usually pronounced zhège, with 个 in a neutral tone.

So although 个 by itself is often listed as gè (fourth tone), in 这个 it is commonly weakened:

• 这 = zhè
• 个 = ge (neutral)

So learners usually pronounce:

zhège duì yǒu hěnduō rén

That is the most natural everyday pronunciation.

个 is acceptable and very common in everyday Mandarin, especially for learners.

However, Mandarin sometimes uses more specific classifiers for certain nouns. For teams, especially in some formal or sports-related contexts, you may hear a more specific classifier.

Still, 这个队 is natural and widely understood, and it is the safest basic form to learn first.

So the practical answer is:

• 这个队 = correct and common
• more specific classifiers may exist in certain contexts, but you do not need them first

Yes. Some common alternatives are:

• 许多 = many
• 不少 = quite a few / not a few
• 好多 = a lot of (more colloquial)

Examples:

• 这个队有许多人。
• 这个队有不少人。
• 这个队有好多人。

All are possible, but 很多 is one of the most common and useful choices for beginners.