they,catching,butterflies,are(?) 排序

Are they catching butterflies是什么意思? they,catching,butterflies,are(?) 排序 They are catching a b___. catching. catching they,catching butterflies,are(?)连词成句 butter butter they didn't have to be afraid of catching SARS如何对CATCHING SARSthey didn't have to be afraid of catching SARS如何对CATCHING SARS提问 look!they are catching the cat改成被动句 将are,they,catching,mosquitoes(.)连词成句 将are,they,catching,mosquitoes(.)连词成句 They haven't------------- A any butter B some butter各位看一看选哪个啊 What delicious cakes!they would taste____(well) with butter are they catching butterflies yes,they are./no,they arent翻译中文 变成一般疑问句 I'm catching butterfies. They are in the woods. He's watching insects They are going to catching butterflies.句中的catch要加ing吗? 明天月考= =.急救啊.The police had a hard time _____the thieves,but they didn't take great trouble____theri head.A.to catch,catching B catching,to catchC in catching ,in catching D to catch,in catching为什么选B不能选A