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was am have been had been
had; have gone have; have gone have; went had; go
By the time Until After Unless
three the third third three
have gone go have been will go
a third time the third time third time three times
failed had failed have failed failing in
I realized I had realized had I realized did I realize
visited; came have visited; came visited, have come have visited, have come
a two-thirds time two-third the time the two-thirds time two-thirds the time
have visited; came have visited; have come visited; came visited; have come
came; had visited had come; visited came; have visited had come; have visited
was am have been had been
By the time Until After Unless
不填; a 不填; the the; the the; a
first second third fourth
have visited, came have visited, have come visited, came visited , had come
不填;a 不填;the the;the the; a
have visited; came have visited; have come visited; came visited; have come
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