has been used to detect gold,这是什么时态?句中的used to 是表示过去常常做某事吗?A new machine called 'The Revealer' has been invented and it has been used to detect gold which has been buried in the ground.这句中的it has been u
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has been used to detect gold,这是什么时态?句中的used to 是表示过去常常做某事吗?A new machine called 'The Revealer' has been invented and it has been used to detect gold which has been buried in the ground.这句中的it has been u
has been used to detect gold,这是什么时态?句中的used to 是表示过去常常做某事吗?
A new machine called 'The Revealer' has been invented and it has been used to detect gold which has been buried in the ground.这句中的it has been used to detect gold是什么时态?used to 是表示过去常常做某事的意思吗?has been buried in the ground这句是现在现成时的被动态吗?请详解.
has been used to detect gold,这是什么时态?句中的used to 是表示过去常常做某事吗?A new machine called 'The Revealer' has been invented and it has been used to detect gold which has been buried in the ground.这句中的it has been u
两者都是现在完成时.has been used to是be used to的现在完成时形式,是“从发明以来一直被用来勘探金矿”的意思,而同样的has been buried in the ground是be buried in the ground的现在完成时形式,就是说“金矿一直被埋在地下”.可以看出两者都是被动语态的现在完成时形式,用法为sth./sb.+has/have+been+done(动词过去分词).现在明白了吗?
has been invented and it has been used to detect gold which has been如果按照你的建议，改为过去完成时，主句从句中的这两种时态，跨度就太大了
这是新概念第二册中的一课。
1/ has been used to detect gold，... 是被动语态+现在完成时态；
2/ used to 应当同前面的 has been 联系在一起看，在这里是指 “被用于做......” 用途。
3/ ... has been buried in the ground 你说的对的，是现在现成时的被动态。