The lines that best expresses a theme in the poem is <u>she smiles and smiles and will not sigh.</u>
This is because, according to the first stanza, the poet describes someone (or something) that is optimistic and will keep smiling, no matter what.
A poem is a collection of words by a poet, that is used to convey his feelings and thought.
A theme is the central idea or main aim of a piece of writing.
A stanza is a collection of one or more lines in a poem.
Therefore, from the given poem, the lines that best expresses a theme is <u>she smiles and smiles and will not sigh.</u>
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