1. 英语中is和are过去式的写法和运用
is 过去式是 was, are 的过去式是were.
1,This letter is wet now. This letter was dry .
2,My shoes are clean now. My shoes were dirty.
3. His room is clean and tidy now. His roon was mass .
4,The weather is warm . The weather was so cold.
2. is,am,are的过去分词和过去式分别是什么
is和am 的过去式 都是 was
are 的过去式是were
过去分词都是been
be动词，意思和用法很多，一般的意思是：是，此种用法，有多种变化形式，is,am,are,was,were,being,beenteen,to be.另外，be动词还有成为的意思。根据句子中不同的人称、数和时间，型态，应该选择相应的be动词。
扩展资料
“Be”除了原形的“be”之外，还有另外七种形式：am, is, are, been, being, was, were.
要看语句的时态：
如果是一般过去时，就用was/were
如果是一般现在时，就用am/is/are
如果是一般将来时，就用will be
然后看主语的人称及复数形式：
参考资料百度百科-be动词