YOU SAID:

I have to read a cool book

INTO JAPANESE

私はクールな本を読まなければなりません。

BACK INTO ENGLISH

I have read a cool book.

INTO JAPANESE

私はクールな本を読んでいます。

BACK INTO ENGLISH

I has read a cool book.

INTO JAPANESE

私はクールな本を読んでいます。

BACK INTO ENGLISH

I has read a cool book.