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.
到明年夏天我在这里教学就有16年了。
By next summer, I will have been teaching here for seventeen years.
到明年夏天，他在这里工作就满20年了。
By next summer, he will have been working here for twenty years.
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，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.
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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