were sb doing还是were sb did sth?就像这个句子：Were they planting a big tree in the garden?还是Were they planted a big tree in the garden?那个...还有一个We must buy enough food for the trip.怎样改一般疑问句？

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were sb doing还是were sb did sth?就像这个句子：Were they planting a big tree in the garden?还是Were they planted a big tree in the garden?那个...还有一个We must buy enough food for the trip.怎样改一般疑问句？
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were sb doing还是were sb did sth?就像这个句子：Were they planting a big tree in the garden?还是Were they planted a big tree in the garden?那个...还有一个We must buy enough food for the trip.怎样改一般疑问句？
were sb doing还是were sb did sth?
就像这个句子：
Were they planting a big tree in the garden?
还是
Were they planted a big tree in the garden?
那个...
还有一个
We must buy enough food for the trip.
怎样改一般疑问句？

were sb doing还是were sb did sth?就像这个句子：Were they planting a big tree in the garden?还是Were they planted a big tree in the garden?那个...还有一个We must buy enough food for the trip.怎样改一般疑问句？
Were they planting a big tree in the garden?
be 动词后面跟ing形式的
Must we buy enough food for the trip?

Were they planting a big tree in the garden?

选择前者．因为是询问一个过去的 在种树的 状态
后者想要询问的话应该 以did开头
因为是针对后面种树的动作
第二个问题
改为
do we have to buy enough food for the trip?

Were they planting a big tree in the garden是对的
Were they planted a big tree in the garden还原是 they were planted a big tree in the garden.不能用被动，是错的

第一个
be动词加动词ing形式表示正在进行
没有be did
只有be done 表示被动

第一个

Were they planting a big tree in the garden?
must we buy enough food for the trip?

过去时态时,there were sb 接doing还是什么? 是were doing 还是were did was/were后接doing还是did Do you remember what were you doing 还是Do you remember what you were doing 急 what were you doing? 英语,were doing? were sb doing还是were sb did sth?就像这个句子：Were they planting a big tree in the garden?还是Were they planted a big tree in the garden?那个...还有一个We must buy enough food for the trip.怎样改一般疑问句？ while sb was/were doing与when sb was/were doing有什么区别呢?什么时候用前者,什么时候用后者 it's high time that sb were还是was were what were you doing this morning还是what are you doing this morning What were the earliest Americans doing for those many centuries?问：doing是非谓语还是谓语 what were you doing 为什么是were不是what keep sb doing还是keep sb do ? ? ? ? ? ? ? ? ? I + were还是was? 翻译：昨天晚上的这个时候你在做什么? what were you doing at this time yesterday evening 还是what were you doing this time yesterday evening excuse doing还是excuse sb doing mind sb do 还是doing