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have worked have been working were working had worked
had studied has studied studied was studying
the earth was in molten state the earth surface temperature was above 100℃ the earth surface temperature was below 100℃ rain water could remain on the earth
for twelve years ago since she was four twelve years ago at the age of four
studied study had studied was studying
cities but not countryside of China both cities and countryside of China countryside but not in large cities everywhere
studied study had studied was studying
live in their house of brick and mortar live in an apartment similar to westerners led a totally westernized life was poor as they always were
has played play played had played
What a relief Congratulations How surprising I’m so sorry
have seen saw had seen will see
don’t know,have studied didn’t know, had studied didn’t know,studied don’t know, am studying
have learned learned am learning had learned
was studying study had studied studied
for twelve years ago since she was four twelve years ago at the age of four
studied study had studied was studying
have studied had studied studied am studying
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