an activity to carry out as part of a study an activity carried out as part of a study 两句话区别

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anactivitytocarryoutaspartofastudyanactivitycarriedoutaspartofastudy两句话区别anactivitytocarryoutasparto

an activity to carry out as part of a study an activity carried out as part of a study 两句话区别
an activity to carry out as part of a study an activity carried out as part of a study 两句话区别

an activity to carry out as part of a study an activity carried out as part of a study 两句话区别
to carry out-------- 指的是将来要做的事情
carried out---------指的是已经做过的事情
being carried out-----指的是正在被做的事情

palmaking 的回答对。动词不定式做名词的后置定语有将来意味,或者表将来行为,动词过去分词有被动或已经过去的意味,而 现在分词则有进行意味。当然,being done 有表示“正在被·。。。”的意思了。