i think they are having a physics class.改为否定句

where are they I think they are at a ()()一空一词 I think they are at home? I think they are---(happy,happily) I think these bikes are ( )(they) I don't think they are in.(同义句转换)I don't think they are ( ) ( ). They speak German.So I think they are ____(German). they,but i think they are good man 为什么think they 的they不是them?I think they are scary. I dont like bananas .I think they are too sweet . Whose sweaters are these?I think they are__________(them) I think they are hers.指出句子的成分. I think they are funny 改为否定句 I think they are Englishmen.（改为否定句） I think they are just so_so 变否定句 英语翻译whose combs are they _____ _______,I think I think they are beautiful 改成否定句 I think they are over there .(改为否定句)__________________________. I think they are customs officers.改为否定句是什么