ibelieve后面加什么介词

可以不加，也可以加in，例如：

1、Why should I believe you? Everything you ever told me was a lie.我为何要置信你你所说的一切都是谎言。

2、I believe competent authorities will handle the case involving the21 Indians youmentioned according to law.你提到的21名印度人在深圳的问题，相信有关部门会依法处理。

3、I believe we will create the splendor for Xineng day by day.我相信，以后的每一天都能创造锡能的辉煌！