YOU SAID:
The Water in the pool is starting to drain
INTO JAPANESE
プールの水が減り始めています
BACK INTO ENGLISH
The water in the pool is starting to decrease
INTO JAPANESE
プールの水が減り始めました
BACK INTO ENGLISH
The water in the pool has started to decrease
INTO JAPANESE
プールの水が減り始めました
BACK INTO ENGLISH
The water in the pool has started to decrease
That didn't even make that much sense in English.