YOU SAID:

My feet are tired I need to rest them

INTO JAPANESE

私の足は疲れている私はそれらを休ませる必要があります

BACK INTO ENGLISH

My feet are tired and I must rest them

INTO JAPANESE

私の足は疲れているし、私はそれらを休まねなければならない

BACK INTO ENGLISH

My feet are tired and I have to rest them

INTO JAPANESE

私の足は疲れているし、私はそれらを休まなければなりません

BACK INTO ENGLISH

My feet are tired and I have to rest them