1) You'd be mistaken to assume that they can get you anything you need.
2) You'd be mistaken to assume that they can get you just anything you need.
3) I don't think they can get you anything you need.
4) I don't think they can get you just anything you need.
Which mean:
a) I think/you have to know that they can't get you just anything you need.
which mean:
b) I think/you have to know that they can get you nothing you need
and which mean
c) I think/you have to know that they cannot merely get you all that you need. They'll have to do more!
Gratefully,
Navi.
You haven't asked a question, so I'm only going to comment on two of your sentences. 3) I don't think they can get you anything you need. They can get you nothing that you need.
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You haven't asked a question, so I'm only going to comment on two of your sentences.
3) I don't think they can get you anything you need. They can get you nothing that you need.
4) I don't think they can get you just anything you need.