1 appear to be doing sth的理解
MALE STUDENT: Exactly! So, yeah, the chinampas... The article said, very clearly, these floating gardens are proof that the Aztecs invented hydroponic farming.
Para14
FEMALE PROFESSOR: Well, chinampas are artificial islands, built up in shallow lakes-islands made from packed earth and weeds, and, uh, material from the bottom of the lake.
Para15
FEMALE PROFESSOR: They may have appeared to be floating in the water, but in fact they reach all the way to the bottom of the lake.
Para16
FEMALE PROFESSOR: So the primary growing medium-what the plants draw nutrients from-is actually soil, not water.
请问老师，这里的they may have appeared to be floating in the water和hey may have appeared to flaot in the water,在语意和逻辑上有什么区别?
最佳答案 2019-09-09 12:51
to do 表示在appeared 之后发生。
to be doing 表示与appeared 同时发生。
不定式与谓语动词表示的时间关系：
1. 一般式（体）：It seems to rain this afternoon.
一般式往往表示其动作在谓语动词之后发生。例句说明，“今天下午看起来要下雨。” rain应在seem 之后发生。
2. 进行式（体）：It seems to be raining outside.
进行式往往表示不定式的动作与谓语动词同时发生。例句说明，“外面好像正在下雨。”（指在室内听见外面有下雨的声音或迹象）, rain 和seem 同时发生。
3. 完成式（体）：It seems to have rained last night.
完成式表示不定式的动作发生在谓语动词之前。例句说明，“昨晚好像下了雨。”（指早晨起床后发现地面潮湿，有下雨的迹象，才做出如此判断）, rain 发生在seem 之前。
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