Consider the following Chinese sentence and its English translation: (1) with Sharon Decoding can be cast as a (monolingual) parsing problem because we only need to parse the source-language side of the SCFG, as if we were constructing a CFG by projecting the SCFG onto its Chinese side: The only extra work we need to do for decoding is to build corresponding targetlanguage (English) subtrees in parallel.
we build synchronous trees when parsing the source-language input, as shown in Figure 1.