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If all of his promises fall through/are carried out, our national debt will increase by 4.5 trillion over 10 years.

1. Are they synnonymous?

Thanks.
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New2grammarIf all of his promises fall through/are carried out, our national debt will increase by 4.5 trillion over 10 years.

1. Are they synnonymous? -No

Thanks.

Fall through - not come about
What's the opposite of fall through?
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Perhaps you are thinking of - follow through

If all of his promises are followed through/carried out
Hi N2G

The phrasal verbs 'fall through' and 'carry out' are more or less opposite ideas. (But I assume you know that already.)

The phrasal verb 'fall through' indicates a failure (i.e. basically not done or carried out). In my opinion, however, 'fall through' does not collate as well with 'promises' as 'carry out' does. A plan or a deal can fall through, for example.

Others may disagree.

EDIT:

If you use 'follow through' instead, then I would word it this way:

- If he follows through on all of his promises ...
- If all of his promises are followed through on ...
Yankee 'fall through' does not collate
What would be a good substitute for fall through?
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You can renege on a promise - but that really means to go back on your promise.

An idea can fall through. A proposition can fall through.

I would substitute with , fail to materialise.