Suppose I want to describe "work" or types of work on a school. Do I use "is" or "are" in these situations?
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The proposed renovation and rehabilitation of the school is subject to strict design limitations.
or
The proposed renovation and rehabilitation of the school are subject to strict design limitations.
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The proposed rehabilitation and revitalization work on the school is subject to strict design limitations.
or
The proposed rehabilitation and revitalization work on the school are subject to strict design limitations.
I think that terms like "rehabilitation", "revitalization", "construction" and similar "-ion" words are uncountable and therefore take a singular verb. When they are joined with an "and", I suppose the plural verb makes more sense, but it doesn't sound "right." If they are replaced with countable (non-abstract) nouns such as "door" or "window", it's much easier:
The proposed door and window of the school are subject to strict design limitations.
I'm actually even more interested in the answer to my second example – "rehabilitation and revitalization work at the school is/are" – because I find it a bit more challenging. "Work" is also uncountable – is "rehabilitation and revitalization" just an adjective phrase that modifies "work" or is [are] "rehabilitation work" and "revitalization work" separate things, so that when they are joined by "and" they become plural subjects?