YOU SAID:

The green cups have worms going

INTO JAPANESE

緑のカップには虫がいる

BACK INTO ENGLISH

There is a worm in the green cup

INTO JAPANESE

緑のカップに虫がいる

BACK INTO ENGLISH

there is a bug in the green cup

INTO JAPANESE

緑のカップに虫がいます

BACK INTO ENGLISH

there is a bug in the green cup