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Discover LudwigSuggestions(5)
"when they perceive" is correct and can be used in written English.
It can be used to introduce a dependent clause in a sentence which describes how someone feels after something happens. For example, "The students felt frustrated when they perceived their teacher was not paying attention."
Exact(60)
Male mice emit ultrasonic noises when they perceive a female.
They'll divest when they perceive the damage to their brand may be consequential.
Not surprisingly, judges often display a special sensitivity when they perceive a challenge to the integrity of the legal system.
It can be shown statistically that countries that receive nuclear assistance are more likely to build nuclear weapons, especially when they perceive threats to their security.
Political scientists have found that white voters are more likely to oppose spending plans when they perceive the main beneficiaries to be children of immigrants (especially illegal immigrants).
Our vast and highly liquid financial markets enable large institutional shareholders to sell their shares when they perceive inadequacies of corporate governance, rather than fix them.
Large swaths of people reassess their beliefs when they perceive forms of backwardness, fanaticism and violence prevailing among some of the adherents of their own religion.
People only increase their spending when they perceive an increase in their permanent income.
This study clearly indicates that patients are dissatisfied when they perceive a lack of basic information being given.
Individuals become afraid when they perceive a threat over which they believe they have little control [3], [4].
The strategy here being that students will consult the web site just when they perceive a need for its contents.
More suggestions(19)
when they believe
why they perceive
when they feel
when they appreciate
when they receive
when they understand
whereby they perceive
however they perceive
well they perceive
when they understood
and they perceive
when they seeing
then they perceive
who they perceive
when they view
whenever they perceive
once they perceive
when they see
provided they perceive
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com