英语的改写句子，时态学的太多了，快被搞死了..

Question

Billy is writing a letter to his friends now.(用yesterday改写)
到底是要改成过去进行时还是一般过去时啊QAQ[欲哭无泪的窝]
过去进行时的结构是：主语+was/were+过去分词（~ing还是~ed窝forgot了..）

Answer 1

过去进行时结构是主语+was/were+doing
yesterday应该用一般过去时即 Billy wrote aletter to his friends yesterday.
过去进行时应该有更具体的小范围的时间点更合适 yesterday范围稍大用一般过去时更合适
望采纳

Answer 2

Bill wrote a letter to his friends yesterday.

表示过去的时间状语yesterday ， 改写成过去时就可以了。
过去时态构成： 主语+ 动词的过去式 其被动式 是 was/ were + 过去分词
过去进行时的构成 ： 主语 + was/ were + 现在分词 也就是 动词的ing 形式
其被动式是 was / were + being + 过去分词

Answer 3

只有个yesterday就是改成一般过去时，过去进行时应该是 the same time yesterday.

所以改为：Billy wrote a letter to his friend yesterday.

过去进行时是was/were + ing.本回答被提问者采纳

Answer 4

进行时是ing。一半过去时和过去进行时都可以改，意思不一样，前者指昨天写了信，后者指昨天正在写信时。bill wrote a letter to his friends yesterday.bill was writing a letter to
his friends yesterday