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vocabulary pronunciation grammar communication
command possession authority control
must build have to build must be built have built
Before have we never seen each other Never before we have seen each other Each other have we seen never before Never before have we seen each other
twenty-first twentieth-first twenty-one twentieth-one
every time the first time for the first time by the time
Actually Frequently Gradually Certainly
every time the first time for the first time by the time
Before have we never seen each other Never before we have seen each other Each other have We seen never before Never before have we seen each other
must be built have to build must build have built
have to build must build have built must be built
then however indeed otherwise
the weather always remains the same in a day a fine day can't last for long we rarely think about the weather the weather changes a lot
treat；as think of；as consider；as consider；to be
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