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qingyuexiao
过去式啊,did是助动词,was是系动词, did提问的是过去发生的动作,接的是动词,如 Did you go(动词原形) to school yesterday? was直接提问的是名词、形容词等,如: Was he happy yesterday? 当然,如果是过去进行时或者过去将来时会用was,如: Was he sleeping when you came back yeasterday? Was he going to sing if he felt happy? 你可以把句子还原成肯定句,was变成肯定句,也存在,did变成肯定句就不存在了,而是用动词的过去式代替。比如此题,变为肯定句是: He had a picnic last weekend. 而不是: He was have a picnic last weekend. 当然,如果说: He was going to have a picnic last weekend. 这种说法也可以,过去将来时。不过时间条件上应该更明显些!