A,AN,SOME,ANY

A/An

100

There is [a/an] apple.

There is an apple.

200

There is [a/an] pit in the avocado.

There is a pit in the avocado.

300

There isn't [a/an] fruit salad on the table.

There isn't a fruit salad on the table.

400

There is [a/an] bag of grapes in the fridge.

There is a bag of grapes in the fridge.

500

There is [a/an] orange and [a/an] carrot in my juice.

There is an orange and a carrot in my juice.

Some/Any

100

There are [some/any] grapes.

There are some grapes.

200

There aren't [some/any] avocados at the store. 

There aren't any avocados at the store.

300

There is [some/any] water on the floor.

There is some water on the floor.

400

There aren't [some/any] seeds in the grapes, except one.

There aren't any seeds in the grapes, except one.

500

There aren't [some/any] seeds in the raspberries, but there are [some/any] pits in the cherries.

There aren't any seeds in the raspberries, but there are some pits in the cherries. 

Correct Sentence

100

There is a orange.

There is an orange.

200

There aren't some strawberries in the garden.

There aren't any strawberries in the garden.

300

There is a apple and an banana in your lunch bag.

There is an apple and a banana in your lunch bag.

400

There aren't some orange trees at the apple orchard, but there are any apple trees.

There aren't any orange trees at the apple orchard, but there are some apple trees.

500

Is there an pit in the avocado?

Yes, there aren't any.

Is there a pit in the avocado?

Yes, there is.