When were they there?为什么不说“When were they at there?”句子是新概念英语的,字典上说there adv.在那里 n.那里本句中there在句子是名词吗?为什么不用When were they at there?When were they there?直接翻译的话

When they were There were as many serious problems when cars were parked as when they were traveling at 90 m/h THEY WERE THERE怎么样 They were working when I got there.（对画线部分提问）对were working提问___________ ___________ they __________ when I got there? When were they there?为什么不说“When were they at there?”句子是新概念英语的,字典上说there adv.在那里 n.那里本句中there在句子是名词吗?为什么不用When were they at there?When were they there?直接翻译的话 oh when they were young There was once ___ time ___ they were good friends 为什么填a,when when I got to the park,they were playing ( )there 这里填happy的什么形式 they were not having a meeting when l was there 改被动 when i got there,they were all at table的同义句 When were they there?回答是什么?（回答加中文）!谢谢〜 when they --the villige,they found the two girls were not there Areturned back to B returned to there gave one of the soldiersand when they begin questioning youland on which they wereflies were buzzing along the walls after they were born 和 when they were born What ___ they ___ when you got there?A.have,done B.were,doing C.did,he D.would,to Most human beings are as good as they are because some unsung teacher were there when needed They __flowers when I got there.Awatered Bwere wateringcare wateringA.watered B.were watering C.are watering Why? Most human beings are as good as they are because unsung teachers were there when needed.翻译成汉语