i think is interesting to play football(改为简单句）

原句应该是 I think it is interesting to play football.吧
改为简单句的办法是将I think 改为插入语,即：
It is,I think,interesting.
仅供参考,可是、、回答的句子为： I think ＿＿＿＿ ＿＿toplay football