SHOULD 作为"应该"讲.就是情态动词.有过去式吗.字典没有 shall的过去式是should,但它们都作为情态动词，在用...

should \u5f53\u60c5\u6001\u52a8\u8bcd\u7684\u65f6\u5019\u662f\u6ca1\u6709\u8fc7\u53bb\u5f0f\uff0c\u8fd8\u662f\u8fc7\u53bb\u5f0f\u662f\u5b83\u672c\u8eab\uff1f\u6bd4\u5982can\u7684\u8fc7\u53bb\u5f0f\u662fcould

\u670b\u53cb\uff0c\u4f60\u6709\u70b9\u4e71\u4e86\u3002\u3002\u3002\u6709\u5173\u60c5\u6001\u52a8\u8bcd\u8fd9\u4e00\u8bfe\u7684\u8bed\u6cd5\uff0c\u6b63\u786e\u662f\u60c5\u6001\u52a8\u8bcd\u90fd\u6709\u8fc7\u53bb\u5f0f\u7684\uff0cshould\u672c\u6765\u5c31\u662fshall\u7684\u8fc7\u53bb\u5f0f\u3002\u53ea\u4e0d\u8fc7\u5b83\u4eec\u7684\u7528\u6cd5\u4f60\u9700\u8981\u82b1\u70b9\u5fc3\u601d\u7ffb\u7ffb\u8bed\u6cd5\u4e66\u5c31\u660e\u767d\u4e86\uff01

shall
\u5c06\u6765\u65f6\uff0c\u7528\u4e8e\u7b2c\u4e00\u4eba\u79f0\uff1a I shall be back in a minute.
\u7528\u6765\u8868\u793a\u5f81\u6c42\u610f\u89c1\uff1a Shall I go with you?
\u7528\u5728\u7b2c\u4e8c\u3001\u4e09\u4eba\u79f0\uff0c\u8868\u793a\u547d\u4ee4\uff0c\u8b66\u544a\uff0c\u5141\u8bfa\u7b49\u3002He shall answer for it!

should\u5e94\u8be5
You should be responsible for yourself.
\u8868\u731c\u6d4bIt should be true. \u5927\u6982\u670970-80%\u7684\u628a\u63e1\u3002
should have done\u672c\u5e94\u505a\u67d0\u4e8b\uff0c\u8bed\u6c14\u4e2d\u6709\u8d23\u5907\u3002
You should have come here earlier.\u4f60\u672c\u6765\u5e94\u8be5\u65e9\u70b9\u5230\u7684\u3002

should作独立的情态动词时候没有过去式和过去分词,见例句
1。I knew if I kept at it I should succeed.
我知道如果我坚持下去就会成功。
2。You should take advantage of it.
你应该好好利用这个机会。
下面的用法可能你已经知道，should对过去的猜测,用法;should have done
e.g. They should have finished it .他们应该是已经做完了。

情态动词就是should
should 本身就是shall的过去式了。

should没有过去式和过去分词

同型的。

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