1
There + be + a pool of stagnant water
主语是单数，be动词用is。
There is a pool of stagnant water behind the house.
房子后面有一潭死水。
一潭死水
先理解核心含义，再看它在真实句子里的用法。
一潭死水
a body of still, foul-smelling water that does not flow
There is a pool of stagnant water behind the house.
房子后面有一潭死水。
The garden was neglected, and there was a pool of stagnant water that attracted mosquitoes.
花园被忽视了，有一潭死水吸引了蚊子。
The committee's ideas were like a pool of stagnant water, with no new proposals for months.
委员会的想法就像一潭死水，几个月来没有新提议。
After the heavy rain, a pool of stagnant water formed in the driveway and didn't dry for days.
大雨过后，车道上形成了一潭死水，几天都没有干涸。
主语是单数，be动词用is。
There is a pool of stagnant water behind the house.
房子后面有一潭死水。
turn into 表示状态变化。
The river turned into a pool of stagnant water.
这条河变成了一潭死水。
介词in表示位置。
They found a frog in a pool of stagnant water.
他们在一潭死水里发现了一只青蛙。
Not this
He found pool of stagnant water.
Use this
He found a pool of stagnant water.
错误：缺少冠词。"pool" 是可数名词单数，前面需要不定冠词 "a"。
Not this
There is a pool of stagnated water.
Use this
There is a pool of stagnant water.
错误：误用过去分词 "stagnated" 作形容词。形容水静止不流动应用形容词 "stagnant"。
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复数形式为 pools of stagnant water。
Dictionary facts from BridgeDict normalized sources.