should的过去式和过去分词是什么？
一 、should 作为助动词 shall 的过去式，可以在间接引语中与第一人称主语搭配，表示过去将来时间。
例如：
The group leader announced that we should （= would ） begin to work soon.
小组长宣布：我们不久就开始工作。
二 、should 作为情态动词，通常用来表示现在或将来的责任或义务，译作“应该”、“应当”，这时它可以和 ought to， be supposed to 互换使用。例如：
You should （= are supposed to ） complete your test in time.
你们应该按时做完你们的实验。
扩展资料
should
英 [ʃʊd , ʃəd] 美 [ʃʊd , ʃəd]
(常用于纠正别人)应该，应当，(提出或征询建议)该，可以，(表示预期)应该会，可能
例句：I should exercise more
我应该多锻炼一些。
短语搭配
Should be应尽量 ，应该是 ，应该的， 应某
Should eat应多吃 ，应该多吃
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