Puns that only English nerds will understand

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Q: "What happened when Past, Present, and Future walked into a bar?"
A: "It was tense."

Q: "Why are apostrophes terrible to date?"

A: "They're too possessive."

Q: "Which dinosaur knows a lot of synonyms?"

A: "The Thesaurus."

Q: "What’s the difference between a cat and a comma?"

A: "Cat: claws at the end of paws.
Comma: pause at the end of a clause."