Difference between good and well

[Heinze]

Test No. errors/advan-1 "Give me the bill", question 4

It is quite acceptable to pay a lot for high quality work especially if the service is very well.

(a) quite
(b) to pay
(c) if
(d) well

Test No. errors/advan-1 "Give me the bill", answer 4

It is quite acceptable to pay a lot for high quality work especially if the service is very good.

Correct entry: good
The error was: (d) well

You have found the error and your entry is correct.
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What exactely is the difference between well and good

[Torsten]

Good is an adjective and well is an adverb. In the sentence you are referring to the adjective good is required because it describes the noun services.

The service of this company is very good. (adjective describing a noun)
They serve their customers very well. (adverb describing a verb)
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TOEIC Preparation & TOEIC Vocabulary

[unclecharlie]

So, is "All is well" or "I hope everything is going well" incorrect? Should it be "I hope everything is going good" or "All is good" since it appears that the description is of the noun "All..." or "...everything..." as opposed to "...is..."?

[Torsten]

As you probably know the word well can be an adjective as well as an adverb. In some of the set phrases you are referencing well is used as an adverb and in others it functions as an adjective.
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TOEIC Preparation & TOEIC Vocabulary

[Guest]

Actually, in those sentences, isn't the "Well" modifying the verb "is"?

In that case it would still be an adverb. So "I hope all is going well" would have "well" modifying "is going" so it's functioning as an adverb.