A news article titled "https://www.yahoo.com/news/one-week-trump-shakes-washington-world-062839474.html" starts with this:
Donald Trump hurtled through his first week in power, punching out at critics, dishing up "alternative facts," polarizing public opinion and making good on an electoral promise to shake up Washington.
One week into the Trump era and there is a serious case of political whiplash in America's capital.
My question is twofold and is about the last sentence.
First, can and be replaced with a comma?
One week into the Trump era, there is a serious case of political whiplash in America's capital.
Are both equally possible and natural?
Second, regarding the part One week into the Trump era, can it be rewritten as follows when followed by either and or a comma?
(1) One week in the Trump era (impossible when followed by either and or a comma)
(2) One week in (possible when followed by either and or a comma)
(3) One week into (impossible when followed by either and or a comma)
(4) In one week (possible when followed by a comma; not sure about when followed by and)
My own opinions are noted in the brackets.
JungKim First, can and be replaced with a comma? Yes. For me, the sentence connects just a little better with "and".
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JungKimFirst, can and be replaced with a comma?
Yes. For me, the sentence connects just a little better with "and".
You are correct about (1), (2) and (3).
(4) is grammatical with a comma, but the combination "In one week, there is ..." doesn't seem completely clear to me. (4) is not possible with "and".