was\were后是否加动词ing在They are doing some shopping at the moment.（用a moment ago 改写句子）.我无法确定are改成were后,doing是不变,还是变do.请大家集思广益,

was\were后是否加动词ing在They are doing some shopping at the moment.（用a moment ago 改写句子）.我无法确定are改成were后,doing是不变,还是变do.请大家集思广益,
was\were后是否加动词ing
在They are doing some shopping at the moment.（用a moment ago 改写句子）.我无法确定are改成were后,doing是不变,还是变do.请大家集思广益,

was\were后是否加动词ing在They are doing some shopping at the moment.（用a moment ago 改写句子）.我无法确定are改成were后,doing是不变,还是变do.请大家集思广益,
a moment ago是刚才的意思
改为they were doing some shopping a moment ago.
变成过去进行时,表示过去某个时刻正在进行的动作或状态：他们刚才正在购物.