Final answer:
A governess may find children's behavior 'too good' if it seems unnatural, possibly indicating underlying issues or deceptions. Such behavior is often used in literature to hint at deeper tensions or the unreliability of perception.
Step-by-step explanation:
The question refers to a character's suspicion about the behavior of children in a work of fiction. This sense of “too good” behavior may strike the governess as unnatural or deceptive because it deviates from expected childlike behavior that typically includes mischievous or spontaneous actions.
In literature, this uncanny perfection in children may serve as a literary device that indicates underlying issues or tensions. For instance, it can foreshadow a revelation about the children's true nature or the governess's perception. The seemingly ideal behavior could also be a reflection of the children's desire to please the governess or hide something from her, thus suggesting that their comportment is a facade.
Examples from classic literature often explore themes of innocence, corruption, and the unreliability of perception, where the characters' behavior stands in contrast to societal norms or expectations.