Both the simple form and the -ing form are grammatically correct, so you can't make a grammar mistake. But a speaker might choose one over the other. Read the situation, then decide which form seems better to you in the sentence that contains a verb of perception. Remember that the -ing form gives the idea that an activity is in progress when it is perceived.
Chase
Chasing
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Slam
Slamming
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Play
Playing
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Snore
Snoring
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Call
Calling
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Walking
Is walking
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Calling
Is calling
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Play
Playing
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Singing ... laughing
Is singing ... laughing
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Land
Landing
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