YOU SAID:

I had to walk my cactus and water my cat

INTO JAPANESE

サボテンを歩いて猫に水をやらなければなりませんでした

BACK INTO ENGLISH

I had to walk the cactus and water the cat

INTO JAPANESE

私はサボテンを歩き、猫に水をやらなければなりませんでした

BACK INTO ENGLISH

I had to walk the cactus and water the cat