A.T. Robertson Commentary Romans 6:5

"For if we have become united with [him] in the likeness of his death, we shall be also [in the likeness] of his resurrection;" — Romans 6:5 (ASV)

For if we have become united with him by the likeness of his death (ε γαρ συμφυτο γεγοναμεν τω ομοιωματ του θανατου αυτου). Condition of the first class, assumed to be true. Συμφυτο is old verbal adjective from συμφυω, to grow together. Baptism as a picture of death and burial symbolizes our likeness to Christ in his death.

We shall be also united in the likeness of his resurrection (αλλα κα της αναστασεως εσομεθα). The conclusion to the previous condition introduced by αλλα κα as often and το ομοιωματ (in the likeness) must be understood before της αναστασεως (of his resurrection). Baptism is a picture of the past and of the present and a prophecy of the future, the matchless preacher of the new life in Christ.