after前用动词的什么形式例如:another boy (run)after him but he cannot catch him.把run改写成正确的形式,

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after前用动词的什么形式例如:another boy (run)after him but he cannot catch him.把run改写成正确的形式,
after前用动词的什么形式
例如:another boy (run)after him but he cannot catch him.
把run改写成正确的形式,

after前用动词的什么形式例如:another boy (run)after him but he cannot catch him.把run改写成正确的形式,
runs