YOU SAID:

I will start studying in two weeks.

INTO JAPANESE

私は 2 週間で勉強を始めます。

BACK INTO ENGLISH

I'll start studying in two weeks.

INTO JAPANESE

私は、2 週間で勉強を始めるよ。

BACK INTO ENGLISH

So I start studying in two weeks.

INTO JAPANESE

だから私は、2 週間で勉強を始めます。

BACK INTO ENGLISH

So I start studying in two weeks.