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to read to have read reading to be reading
clean; clean clean; to clean to clean; clean to clean; to clean
has been went has gone goes
should plan has planned would plan had planned
have, their has, his have, his has, their
was watching is watching has watched had watched
have, their has, his have, his has, their
Tom has lost his bike four days ago Tom has lost his bike for four days Tom lost his bike for four days It’s four days since Tom lost his bike
thinks to think thought thinking
passengers have his own room passengers has his own room passengers have their own room passenger have their own room
he; his him; he’s his; his him; his
died; had sat has died; has sat has died;is sitting died; has been sitting
died; had sat has died; has sat has died; is sitting died; has been sitting