Answer :
Model: modeling (present participle/gerund), modeled (past tense), modeler (noun for someone who models)
Signal: signaling/signalling (present participle/gerund), signaled/signalled (past tense), signaler/signaller (noun for someone who signals)
Adding suffixes to words is a common way to change their form and function. In this case, the suffixes -er, -ed, and -ing are used to create different verb forms or nouns from the base words "model" and "signal".
"Modeling" and "signaling" are present participle forms that describe ongoing actions. "Modeled" and "signaled" are past tense forms used to describe completed actions. Finally, "modeler" and "signaler" are nouns that refer to people who engage in modeling or signaling activities.
It's important to note that the spelling of "signaling" and "signaled" can vary depending on whether you use American or British English. American English typically uses a single "l", while British English uses a double "l".
To learn more about suffixes, here
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