我一直深信着用英语怎么说

I've always firmly/deeply/strongly believed that........
I've always been convinced that........
I'm always convinced that.......
用believe就不要用been, 用convinced 要用be动词的完成时been。

I always firmly believe that ...
I am deeply convinced that...

I have been firmly believed ......

i always believe that
i'm convinced that

LS的不太靠谱

I deeply believe（ in sth ）all the time.