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Do you know what they are? you know what they do are 连词成句!帮个忙 do know are they what you连词成句 do you know of any world records?what are they? what are they Do you know?合并一句话 英语翻译do you know what PDAs are?do you have one?they are vert do you know what they are?请问what 为什么要提前,本来不是what are they吗,这 What great scientists do you know?What are they known for? 猜猜看Do you know who they are? Do you know whose kites they are? How many kinds of energy do you know?what are they? Do you know ___ books they are ?A.what B.whoseC.whichD.where