there ____(not be ) much water in the sun

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there ____(not be ) much water in the sun
there ____(not be ) much water in the sun

there ____(not be ) much water in the sun
there _isn't_(not be ) much water in the sun
water 不可数,所以用第三人称单数

there isn't____(not be ) much water in the sun

isn't,much 说明water不可数,所以用单数。