Hello! I hope you're doing well. Would you, please, check my understanding of article usage in *'amount of something'*? Here are my examples and reasoning:

*Context 1: **Our man has been building a house for three days = It's the entire amount of work.a) It's hard to estimate [the amount of work] [he did yesterday].b) It's hard to estimate [the amount of] [work he did yesterday].*

c) It's hard to estimate [the amount of the work] [he did yesterday].

d) It's hard to estimate [the amount of] [the work he did yesterday].

c) It's hard to estimate [the amount of the work] [he did yesterday].

d) It's hard to estimate [the amount of] [the work he did yesterday].

I tend to choose c-d) because of all of the work, I'm trying to estimate only the amount of yesterday's part. There's an implied contrast between the entire work and yesterday's part. But I'm not sure what variant of the bracketing is correct. I use it for dividing the noun phrase into logical parts.

Context 2: *Our man was building a house all day yesterday = It's the entire amount of work.e) It's hard to estimate [the amount of work] [he did yesterday].*

*f) It's hard to estimate [the amount of ] [work he did yesterday].*

g) It's hard to estimate [the amount of] [the work he did yesterday].

h) It's hard to estimate [the amount of the work] [he did yesterday].

g) It's hard to estimate [the amount of] [the work he did yesterday].

h) It's hard to estimate [the amount of the work] [he did yesterday].

I tend to choose e-f) because the work being estimated is all of the work. I'm not sure about the bracketing.