中科新闻网python def函数:You__him so closely;you should have kept your distance.
来源：百度文库 编辑：中科新闻网 时间：2024/04/28 06:58:04
shouldn't follow mustn't follow
couldn't have been following shouldn't have been following
_____from space,the earth,with water___20% of its surface,looks like a "blue ball".
Seen covered
Seeing covering
Seeing covered
Seen covering
第一题为什么不能用shouldn't follow
couldn't have been following shouldn't have been following
_____from space,the earth,with water___20% of its surface,looks like a "blue ball".
Seen covered
Seeing covering
Seeing covered
Seen covering
第一题为什么不能用shouldn't follow
You__him so closely;you should have kept your distance.
mustn't follow
_____from space,the earth,with water___20% of its surface,looks like a "blue ball".
Seen covering
You shouldn't have been following him so closely;you should have kept your distance.翻译：你本不应该一直紧跟她，你本应和他保持距离。
从后一句should have kept your distance，可以看出是对过去的虚拟，意思：你本应该保持距离。由此说明你没有保持距离，而是跟得紧，对过去进行行为的虚拟，用should have been doing
Seen from space,the earth,with water covering 20% of its surface,looks like a "blue ball".
seen 与句子主语the earth是被动关系，用过去分词作状语，相当于一个状语从句if it is seen from space,
covering与其逻辑主语water是主动关系，用现在分词作定语，相当于定语从句，which covers
不知是否清楚，若不明白，可继续追问。
mustn't follow
Seen covered