the,lesson,it,on,first,is,Monday(.)（连词成句） She is my good friend.（改为复数句）
1、the,lesson,it,on,first,is,Monday(.)（连词成句）
2、She is my good friend.（改为复数句）
是1、The first lesson is on Monday.
They are our good friends.
还是2、It is the first lesson on Monday.
They are our good friends.