i think```,he will not be back in an hour 把这两句合并

来源：学生学帮网编辑：学帮网时间：2024/06/03 04:13:39

I don't think he will be back in an hour.
否定前移.

i don't think he will be back in an hour .

I don't think he will be back in an hour.

I do not think he will be back in an hour.