各位好,想請問一個問題
He keeps practicing _______(play) baseball every day.
大家普遍都知道keep後面接動名詞, 所以practice要改動名詞Ving
但下一個動詞該如何解釋也是要改playing呢?
謝謝大家

practice + doing (sth)，因此 practice playing baseball句型規定如此，字典和 usage 的書都直接列出，沒寫解釋。

雖然字的用法如樓上所說，但是大家會這樣寫句子嗎？我會直接把play這個動詞省略，當然如果這是考題就沒辦法了

答案是 He keeps practicing playing baseball every day. 因為你要讓 keeps 後面接的仍然是一個 noun phrase (在這裡是個 gerund phrase).舉個更長一點的 noun phrase (把 keep 也串進去) 的例子:We're amazed at his keeping practicing playing baseball every day.