现在完成时
has 后面加 done的形式
be 的don形式是been
have 的done形式是 had
have trouble with是个词组,又因为是现在完成时,所以用 had trouble with,而has had中的has只不过是构成完成时的助动词而已,没有实意动词的意思
请帮我看看这几句英语,--But none of them has been turned to stone yet.-
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