2 Corrected formatting and removed thanks.
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What is ungrammatical about 'that's them'"that's them"?

I was reading 3rd short story in Agatha Christie's Poirot InvestigatesAgatha Christie's "Poirot Investigates" when I stumbled on following sentence:

"That's them," I declared in an ungrammatical whisper.

"That's them," I declared in an ungrammatical whisper.

What is so ungrammatical about 'that's them'that's them? What would be considered grammatically correct instead?

Thanks.

What is ungrammatical about 'that's them'?

I was reading 3rd short story in Agatha Christie's Poirot Investigates when I stumbled on following sentence:

"That's them," I declared in an ungrammatical whisper.

What is so ungrammatical about 'that's them'? What would be considered grammatically correct instead?

Thanks.

What is ungrammatical about "that's them"?

I was reading 3rd short story in Agatha Christie's "Poirot Investigates" when I stumbled on following sentence:

"That's them," I declared in an ungrammatical whisper.

What is so ungrammatical about that's them? What would be considered grammatically correct instead?

1
source | link

What is ungrammatical about 'that's them'?

I was reading 3rd short story in Agatha Christie's Poirot Investigates when I stumbled on following sentence:

"That's them," I declared in an ungrammatical whisper.

What is so ungrammatical about 'that's them'? What would be considered grammatically correct instead?

Thanks.