That – English editing.

A word with a number of different uses:
 Demonstrative Pronoun:
I could get on with a man like that.
 Determiner:
That book is still funny.
 Relative Pronoun:
I stared back blandly with the same expression that he was trying on me.
 Subordinating Conjunction:
A couple of times she had complained that he was trying to adopt her.
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