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starts started is starting has started
the; the 不填; the a; 不填 a; a
learn to learn learning learned
learned; learned learn; have learned have learned, have learned learned, have learned
for two years ago since two years ago two years after since two years later
riding to ride rides ride
had driven has been driven has been driving has driven
ago; for before; since ago; since ago; in
looked through gone through got through passed through
ten years ago twenty years ago more than twenty years ago thousands of years ago
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