到明年夏天，这个班将由布朗先生教毕二年了。
This class will have been taught by Mr.Brown for two years by next summer.
到明年夏天，她在实验室工作将有三年了。
By next summer she will have been working in the laboratory for three years.
到明年夏天，布朗先生在这两个班执教已有两年了。
This class will have been taught by Mr Brown for two years by next summer.
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