Jim talks to Fran on Finn's phone while Finn and Gina watch him.
Jim talks to Fran on Finn's phone while Finn and Gina are watching him.
Jim is talking to Fran on Finn's phone while Finn and Gina watch him.
Jim is talking to Fran on Finn's phone while Finn and Gina are watching him.
Can I freely combine the present perfect simple tense with the present perfect progressive tense or is it bad grammar?
It is not bad grammar; it is perfectly normal to use these tenses in combination as long as it makes sense.
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It is not bad grammar; it is perfectly normal to use these tenses in combination as long as it makes sense.