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  • In this area, we are checking if the pin penetrated through the wood with a sensor
  • In this area, we are checking that the pin penetrated through the wood with a sensor

In this sentence, should I use if or that? I'm assuming a situation where I introduce my work area in the factory to someone.

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Both sentences are correct but "if/whether" is used to express uncertainty or doubt, since "that" is used when we are certain about something.

In this area, we are checking if the pin ...

It is very possible that the pin won't penetrate through the wood and we are checking if it did or not.

In this area, we are checking that the pin ...

In this example, we know that the pin will almost certainly penetrate through the wood but we still check just in case it didn't.

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    Exactly. Checking that implies that you want the pin to penetrate the wood., Nov 30, 2023 at 12:14
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    Thank you very much!!!
    – Jiro F.
    Nov 30, 2023 at 15:23

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