Parallel grammars and parallel treebanks can be a useful method for studying linguistic diversity and commonality. We use this approach to study how arguments to similar predicates are realized across languages. To that end, we formulate formal principles for aligning at phrase and word levels based on translational correspondences at predicate-argument level. A first version of a new tool for creating, storing, visualizing and searching treebank alignment at different levels has been constructed. 1