1.Is
the
English
song
often
sung
by
these
students?
被动语态的组成是be动词+动词的过去分词形式，改为被动句时要和原句的时态一致，这一句中原句时态为一般现在时，所以被动句也要是一般现在时，而主语为the
English
song，视为单数，所以be动词用is，动词sing的过去分词形式为sung
2.She
began
to
learn
dancing
when
she
was
four.
句子意思是在她4岁的时候开始学跳舞，所以后面用时间状语从句when
she
was
four
3.She
was
too
weak
to
catch
up
with
others.
句子意思是她太差了以至于都赶不上其他人。词组too……to表示的就是太……而不能……
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