我之前想必是

我 woˇ

I, Me, My, We, Use, Our, Ourselves

之前 zhiˉ qianˊ

(Before, From before, Previously) Before, Previously, From before

想必 xiangˇ biˋ

(In all, Most likely, Most probably, Presumably, Pretty) Presumably, Most likely, Pretty sure, In all probability, Most probably

是 shiˋ

Is, To be, Am/Are/Is/Was/Were, Being, Yes