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had a great time loved themselves helped themselves had a rest
have been; left had been; left am; had left come; had left
have gone have been gone had gone had been gone
have been; went had been; went am; had been come; had been
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have been；left had been；left am；had left come；had left
How; studying What; studying How; to study What; to study
went; had left had been; left have been; left have; had left
Have，shown Do，show Had，shown Did，show
more much many a great deal of
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