'It' is fine in the second example. The demonstrative 'that' just adds a little more emphasis to the statement. Clive
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Clive'It' is fine in the second example.The demonstrative 'that' just adds a little more emphasis to the statement.CliveThank you. Then, why "that" does not work in the first example?
sb70012Why "it" works in the first example but does not work in the second example?I'd go with the "contrast" theory here. In the second sentence 'that' not only refers to 'their camera' (which 'it' can do as well), but it also selects between cell phone, TV, and camera, saying, in effect, 'that last-mentioned item'. In the first sentence there is no reason
CliveFirst example:They sold their camera. They didn’t need it.You can also say 'that' here. But it sounds slightly odd because you have only mentioned 1 item in your context. If there is just one item, you don't really need to 'demonstrate' which item it is.CliveBut once a native English speaker gave me another example which in that example we talk about one
CliveIt seems your speaker wants to add some emphasis.Then, why that "emphasis" does not work in here?
sb70012They sold their camera. They didn’t need that. = (incorrect)Nobody said it was incorrect; it's just that the demonstrative pronoun seems uncalled-for in your example.