to do 和 to be done 是不定式的语态,不是时态.
不定式做目的状语时,要根据句子主语和不定式之间的主动被动关系来判断使用主动结构to do sth还是使用被动结构to be done.
如:To learn more about this country,he read many books in the library.
he 和 learn...之间是主动关系,所以使用主动结构to do sth
To be noticed by him,I raised my hand and called his name loudly.
I 和 notice 之间为被动关系,所以用被动结构to be done