我开始怀疑英文

I begin to doubt if what Tom told me was ture.

I start to doubt whether what Tom told me is true or not.或I start to doubt what Tom told me.

I begin to doubt that whether it's a mistake to love him or not.

I begin to doubt whether what Tom told me is true or not.I begin to doubt whether what Tom told me is the truth.希望能帮到你

I start to suspect whether there is something in the world that never overdue。翻译的很没水准，最好再自己看看吧