2. This is a description of the "big river", which is calm without waves and reflects the stars in the sky, so it is said that "the river is full of silver stars".
This is a description of grass soaked by moonlight on vilen. Because there is water on the grass, it will reflect the moonlight, so the "grass" will "shine silver"
4. Focus on describing the quietness and beauty of the night, reflecting the poet's love for nature and comfortable and quiet mind.
5. Hometown, loud and noisy.