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现在完成时的8个标志词

already(肯定)yet(否定,疑问)just, before, recently,still, lately,never,ever, never, twiceon several occasionin the past few days/weeks/months/years(up to)these few days/weeks/months/yearsthis morning/week/month/yearup to pre...

现在完成时的构成是:主语+have/has +动词的过去分词。主要有两种用法: 表示动作发生在过去某个不确定的时间,但对现在留下了某种影响和结果。常被just、already、yet 等副词修饰; 表示从过去某一时刻开始一直持续到现在的动作或状态。这个动...

具体如下: since:since表示“自从……以来”时,无论是用作介词、连词还是副词,since都通常要与现在完成时连用。 例句: I’ve had nothing to eat since lunchtime. 从午饭时间到现在我什么都没吃。 We’ve lost a lot of custom since our prices...

already:用在肯定句中(be动词、助动词、情态动词之后,实意动词之前)常与yet进行转换。例如:I havealreadyfinished the work.我已经完成这项工作了。 改为否定句:I haven't finished the work yet.我还没有完成这项工作。改为一般疑问句:H...

完成式的构成为: verb to have + 动词过去分词 以动词 do 为例: 现在完成式: have(has) done 过去完成式: had done 将来完成式: will have done 上面都是主动态的,被动态的我举一例: 现在时 have(has) been done 建议你先学主动态的...

already(肯定), yet(否定,疑问), just, before, recently,still, lately,never,ever, never, twice, on several occasion,in the past few days/weeks/months/years,(up to)these few days/weeks/months/years, this morning/week/month/ye...

第一部分: 现在完成时表示过去发生或已经完成的动作对现在造成的影响或结果,也可表示过去已经开始,一直延续到现在的动作或状态。学习现在完成时,先从结构和句式开始: 构成:主语 + have / has + 过去分词 + 其他(当主语是第三人称单数时用h...

由“have/has+过去分词”构成,主要有两个含义: ①表示动作发生在过去,但与现在的情况有联系,有时无时间状语,有时和一些表示不确定的过去时间状语连用,如:many times,just,yet,ever,never,already,before,so far, by now等连用。 ②表...

already表示已经,在现在完成时中与yet词义相同,但结构上不相同 yet用在疑问句或否定句的末尾,而already用于陈述句have或has的后面 already有时也可放在末尾

yet already in the last five/few years for + 一段时间 since every never up to/till now so far Up to the present once recently lately

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