Only when he arrived did the meeting begin请帮我分析这个句子

Only when he arrived did the meeting begin请帮我分析这个句子 He was sleeping late when it arrived The professor found no student in the lecture hall when he arrived.Only then did he realize that he came much too early.求翻译, it was 6 when he arrived home改为疑问句 he was sleeping when it arrived改为一般疑问句 Hardly had he arrived when the bus left.翻译 When she arrived,he ______________the waste into the river.(dump) he were sleeping when the UFO arrived.为什么用were when he arrived in new york ,it was rainning? I was in Beijing on the day when he arrived. when I arrived home,he was cooking与when I arrived home,he cooked差不多的意思吧 为什么是when did he arrived?不是when was he arrived给出例句,将清语法要点 Hardly ( )when it began to rain had he arrived he arrived he he had arrived did he arrive请详细解答正确语序应该是什么？ He ()when you came.A.will arriveB.had already arrivedC.would already arriveD.has already arrived 可以这样改句子吗3 When he arrived I was working in the garden.4 When he arrived I was typing letters.5 When he arrived I was shaving.6 When he arrived I was boiling the milk.7 When he arrived I was phoning to my sister.8 When he arrived I was the bus he was waiting for over half an hour arrived only a minute agoa arrive b arriving c arrived d had arrived为什么选c, When he ( ) home,he had a short rest.A tookB wasC leftD arrived Hardly had he arrived when she started complaining.为什么had在主语he的前面呢