＿ （who）pens are those?

＿ （who）pens are those? These are our pens .They are（）. They are pens(改为否定句） Are these your pens?（同义句转换） Are these ------------ -------------- Are these pens ___? Which are your pens? these pens are （in his bags）就（）提问（） （）thses pens? these pens are （in his bags）就（）提问（） （）thses pens? There are two pens on the desk.(two pens就划线部分提问） Those pens are (black)?(对括号部分进行提问） ___ ___are those pens? There are many pens in the pencil case.(对many pens画线提问） these pens are __theirs_____.(对划线部分提问）_____ _____these pens. Those are pens in English.（对pens部分怎样提问?） They are my colour pens.(变成一般疑问句）-------they-------colour pens? 一道SAT语法, 改句子3. Perhaps （those of us being concerned） should encourage debate about what other levels of government can do to solve the problems of waste disposal. A. those of us being concernedB. those of us who are concernedC. thos what are they are pens Her pens are under the chair(改为一般疑问句） are,the ,the pens,teacher's (连词成句）