为什么
为什么
为什么
为什么
How did
How long has
it was to
have studied
How often
解析如下：
1.by+doing表示方式,凡是对by+doing的提问疑问词均用how,特殊疑问句结构：特殊疑问词+助动词+主语+谓语+其他成分
2.for+时间段表示持续,现在完成时态中,凡是针对for+时间段的提问均用how long,此举是完成时态,所以不能用does,而是用原句中的has
3.动名词做主语的句子一般都可以改成it is/was +adj+to do sth
例如：Playing sports is good for our health===It is good for our health to play sports.
只不过此题中,这个动名词是在间接宾语中that从句中,其实道理是一样的,以后看到类似转换记住就行了.
4.你是通过听录音学习的吗? 是的,通过哪种方式我学了很多.
原句怎么问,你就怎么回答.
5.凡是针对sometimes有时,once a month一个月一次,twice a week一个星期两次,never从不,always(总是),usually(经常),sometimes(有时),seldom(不常)这之类的频率副词的提问,均用how often提问 ,表示 多久一次 记住便可.
How did (问的是怎么学用how, 过去式就改did) 这里是long has (How long has he been 问 , He has been答 问时间,所以用long多长) She said that [it was] helpful [to] memorize the words of pop ...
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How did (问的是怎么学用how, 过去式就改did) 这里是long has (How long has he been 问 , He has been答 问时间,所以用long多长) She said that [it was] helpful [to] memorize the words of pop songs. Yes, I [have]. I,ve [studied] a lot that way. (是的,我有. 我经常这样学习) 问的是频率用 How often
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