The best way to learn proper English is to read news report, and watch news on TV. Watching TV shows is a great way to learn casual English, slang words, understand culture reference and humor. If you have already watched these shows then you may recall the words used in the following dialogs.

HOWARD:
Told you the sensor would work.
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HOWARD:
Told you the sensor would work.
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HOWARD:
Told you the SENSOR would work.
The Big Bang Theory Season 1, Episode 11

This is a sub-sonic impact SENSOR.
The Big Bang Theory Season 1, Episode 11

Now, you'll need to get the SENSOR
close to Sheldon's room.
The Big Bang Theory Season 1, Episode 11

to activate the motion SENSOR.
The Big Bang Theory Season 5, Episode 2

...and the SENSOR apparatus will rest on it.
The Big Bang Theory Season 1, Episode 12