问题描述：
改变这些英语句子的形式.
A snowman is made by us.
改成:
1._____________(simple past tense)
2._____________(present progressive tense)
3._____________(present perfect tense)
4._____________(future tense)
A snowman is made by us.
改成:
1._____________(simple past tense)
2._____________(present progressive tense)
3._____________(present perfect tense)
4._____________(future tense)
问题解答：
我来补答展开全文阅读