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The lady【 wearing】 an expensive diamond necklace looked worr

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The lady【 wearing】 an expensive diamond necklace looked worried.为什么是wearing.不是wore
The lady【 wearing】 an expensive diamond necklace looked worr
句子的主干是The lady looked worried. wearing an expensive diamond necklace 是现在分词短语作定语,修饰the lady.
英语有个规定,动词只能做谓语.动词如果要做主语、宾语、定语等其他成分,要么改成“to+动词原形”,即动词不定式,要么加ing,即变成现在分词.
如果写成wore,那么wore an expensive diamond necklace就只能做谓语.英语一个单句不能出现两个谓语.一定要用wore的话,只好把它改成两句话:
The lady wore an expensive diamond necklace. She looked worried.