Where does “that're” come from?
that're (English) comes from English ’re, from English are, from Middle English aren, from Old English earon, from Old English bēon, from Proto-Germanic bijōniz, from Proto-Germanic bijǭ, from Proto-Indo-European bʰey- — bee.
Ancestry of “that're”, step by step
| Step | Language | Word | Meaning |
|---|
| 1 | English | ’re | — |
| 2 | English | are | second-person singular simple present of be;... |
| 3 | Middle English | aren | Plural present indicative form of been |
| 4 | Old English | earon | third-person plural simple present of wesan |
| 5 | Old English | bēon | to be, become |
| 6 | Proto-Germanic | bijōniz | — |
| 7 | Proto-Germanic | bijǭ | bee |
| 8 | Proto-Indo-European | bʰey- | bee |