sentence: My advice for travelling in Spain is that there are several types of transport but the most economical is public transport , the most expensive transport is a taxi , for example .
modified: My advice to travel for Spain is that there are several types of transport but the most economic is the public , most expensive transport can be the taxi , for example .
transformation: PART, VERB:FORM, PREP, MORPH, DET, NOUN, DET, VERB:TENSE, DET