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He's often promised to help one, but never once done so. |
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He's like lots of other people; he promises to help but rarely does. |
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It's easy for him to promise to help, but he never actually does help. |
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Like so many others, he often promises to help but then forgets to do so. |
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He's the sort of person who is good at promising help, but almost always fails to do so. |