Introduction:
In the poem "The Road Not Taken" by Robert Frost, the poet says he shall tell people "this with a sigh" to convey a sense of regret and contemplation. The poem explores the theme of choices and the impact they have on one's life. The poet's use of a sigh suggests a mix of emotions, including both resignation and a recognition of the significance of the road not taken.

Explanation:
1. Symbolism of the Roads:
The poem presents the speaker at a fork in the road, where he must choose between two paths. The roads symbolize the choices we make in life, and the poet's decision to take the less traveled road represents his desire for individuality and uniqueness.

2. The Significance of the Road Not Taken:
The poet's decision to take the road less traveled has made all the difference in his life. It has shaped his experiences, perspectives, and ultimately his identity. By saying he shall tell people "this with a sigh," the poet suggests that he recognizes the weight of this choice and the impact it has had on his life.

3. Regret and Contemplation:
The sigh in the poem conveys a sense of regret, as the poet reflects on the path not taken and wonders about the alternative outcomes that could have occurred. It represents a moment of introspection and contemplation, suggesting that the poet is aware of the opportunities foregone by choosing one path over another.

4. Ambiguity and Uncertainty:
The poem leaves room for interpretation and speculation, as the poet's choice is not explicitly described as either positive or negative. The sigh could also be seen as an expression of uncertainty about the consequences of the road taken. It embodies the complex emotions that arise from making choices and the ambiguity of their outcomes.

Conclusion:
Through the use of a sigh, the poet conveys a sense of regret, contemplation, and the recognition of the significance of the road not taken. The poem encourages readers to reflect upon the choices they make in life and consider the potential impact those choices may have. It serves as a reminder that every decision we make shapes our journey and defines who we are.