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sp＞sp3＞sp2 sp＞sp2＞sp3 sp3＞sp2＞sp sp3＞sp＞sp2 sp2＞sp3＞sp
worked has worked was working has been working
has he; Yes has he; No hasn't he; Yes hasn't he; No
has taught had taught taught has been teaching
is; come is; have come has been; came has been; have come
SP＞SP2＞SP3 SP＞SP3＞SP2 Sp3＞SP2＞SP SP3＞SP＞SP2 Sp2＞SP3＞SP
sp3>sp2>sp sp>sp2>sp3 sp2>sp>sp3 sp2>sp3>sp sp3>sp>sp2
has not decided are not decided has not been decided have not been decided
has worked worked is working will worked
has come here has started to work has lived there has left the university
sp³＞sp²＞sp sp²＞sp＞sp³ sp²＞sp³＞sp sp＞sp²＞sp³
SP＞SP2＞SP3 SP＞SP3＞SP2 SP3＞SP2＞SP SP3＞SP＞SP2 SP2＞SP3＞SP
sp>sp2>sp3 sp2>sp>sp3 sp3>sp>sp2 sp2>sp3>sp sp3>sp2>sp
sp＞sp2＞sp3 sp＞sp3＞sp2 sp3＞sp3＞Sp sp3＞sp＞sp2 sp2＞sp3＞sp
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