I wasn't at the office yesterday,  - but I am at the office today, You were on vacation last week, - but you aren't on vacation this week :(, She wasn't sick yesterday,  - but she's sick today :(, We were busy before,  - but now we aren't busy, They were the biggest logistics company in 1999, - but now they're the second biggest, It was raining last night, - but now it's sunny,

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