YOU SAID:

I skipped a rock on the river then rowed down the stream

INTO JAPANESE

私は川の上の岩をスキップし、その後、ストリームを漕いで

BACK INTO ENGLISH

I skipped the rocks above the river and then rowed the stream

INTO JAPANESE

私は川の上の岩をスキップし、その後ストリームを漕いだ

BACK INTO ENGLISH

I skipped the rocks above the river and then rowed the stream