when （）they （）（）（）english它们是什么时候开始学英语的

pienso en ti ,piensas en mi?是什么意思（西班牙语） verilog中if（en）中en是什么意思 Pienso en ti.Quiero verte.（西班牙语） Wie hei（贝塔）en sie?是什么意思 siempre pienso en ti （西班牙语）谢谢 PID PIDout=Kp*En + Ki*En总 + Kd*（En-En-1）,算出的PIDout怎么转换成占空比（0-1）? They enjoy listening to music when they do their homework.（改句）They enjoy listening to music when they do their homework.They are _____ _____ listening to music when they do their homework. I （like） these books very much.when were they（ bought）为什么可以这样填空?为什么是“when were they（ bought）”而不是“when did they bought? en plus的发音如题,en plus（而且,并且）中的s发不发音? 东门小学五年级上册品德与社会测试卷（北师大版）en en Don't （）others when they are in trouble. When the bus stopped ,they（ ）the bus. （J ） people usually bow when they meet. It is impolite to（ ）others when they are talking. When did they（ start） the factory?同义句 When people eat junk food ,they become ____.(超重） They met her （when they were walking on the street）.（针对括号部分提问） went.they.when.to.they.years.beijing.five.were.old（连词成句）