ack不是动词,是介词,介词是没有时态的.
动词形态he carried the burden back to the court.其中back为什么不用过去式?是
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Who's glad to see this guy back on the court?翻译
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She'll give it back tomorrow为什么不用过去式.
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They each carried＿＿ on the their backs.
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back过去式过去分词
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动词不定式to为什么Can i have my bike back please?中back 前为什么不加to会不会是书
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Ken pats mocky on the back 改为一般过去式