The comparison structure is: A 比 B + adjective. Unlike English, you don't change the adjective form — just use 比: 他比我高 (He is taller than me), not 他比我更高.
mistakes
Don't use 很 with 比 comparisons. Say 他比我高 (correct), not 他比我很高 (wrong). You can use 多 or specific amounts: 他比我高很多 (He's much taller than me).
