"a great deal of"is an English phrase used to mean a lot, many, or important thing. It is usually followed by uncountable nouns or plural nouns. Here are some examples:
1. a great deal of time has been spent on this project.(A lot of time was spent on this project.) ）
2. she has a great deal of experience in the field of marketing.(She has extensive experience in the field of marketing.) ）
3. there is a great deal of confusion about the new policy.(There's a lot of confusion about the new policy.) ）
4. he has a great deal of knowledge about history.(He has a deep knowledge of history.) ）
5. a great deal of effort has gone into **this event a success.(A lot of effort went into making this event a success.) ）
6. there is a great deal of truth in what she said.(She makes a lot of sense.) ）
7. a great deal of money was spent on the construction of the new building.(A lot of money was spent on the construction of this new building.) ）
8. she has a great deal of patience with her students.(She has a lot of patience with her students.) ）
9. a great deal of research has been conducted on this topic.(A lot of research has been done on this topic.) ）
10. there is a great deal of potential for growth in this industry.(There is a lot of potential for growth in this industry.) ）
In these examples, we can see:"a great deal of"This is followed by different nouns such as time, experience, confusion, knowledge, effort, truth, money, patience, and research. These nouns are all uncountable or plural nouns that denote an abstract concept or concrete thing.
It should be noted that though"a great deal of"Uncountable nouns and plural nouns can be followed by them, but in spoken language, the plural form of singular countable nouns can sometimes be taken as well, especially if the number is large. For example:
1. i h**e a great deal of books to read.(I have a lot of books to read.) ）
2. she has a great deal of friends in this city.(She has a lot of friends in the city.) ）
3. they h**e a great deal of cars in their garage.(They have a lot of cars in their garage.) ）
However, this usage is less common in formal written English and is more commonly used"a lot of"or"many"to indicate a large number of countable nouns. For example:
1. i h**e a lot of books to read.(I have a lot of books to read.) ）
2. she has many friends in this city.(She has a lot of friends in the city.) ）
3. they h**e many cars in their garage.(They have a lot of cars in their garage.) ）
a great deal of"It can be followed by uncountable nouns and plural nouns to indicate a large number, many or important things. In colloquial language, it is sometimes possible to take the plural form of singular countable nouns, but this usage is not common in formal written English. In practical use, the appropriate expression can be selected according to the context and needs.