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最佳答案：规则动词,直接加ed.
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最佳答案：put. opened. looked. picked
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最佳答案：openedplayedsaidpaidsharedtried
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最佳答案：to open 是不是谓语动词,所以没有形态的变化（全是原形）是动词不定式,因为一个句子里不能出现俩动词欢迎采纳o(∩_∩)o
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最佳答案：drops,dropping,droppedfinishes,finishing,finishedopens,opening,openedpasses,pass
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最佳答案：could是情态动词can的过去式,所以couldn't open就是过去式了,情态动词can之后的任何动词都只能用原型,所以open还是只是原型
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最佳答案：uy bought boughtdo did donehave had hadsee saw seenopen opened opened
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最佳答案：live-lived; like-liked; dislike-disliked; post-posted; pay-payed; across-across;
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最佳答案：open--opened--opened
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最佳答案：open live sit study call现在分词openning living sitting studying calling三单形式opens li