However, phrase-based models can fail to reorder words or phrases which would seem obvious if it had access to the POS tags of the individual words.
for example, a translation from french to English will usually correctly reorder the french phrase with POS tags NOUN ADJECTIVE if the surface forms exists in the phrase table or language model, e.g., phrase-based models may not reorder even these small two-word phrases if the phrase is not in the training data or involves rare words.