Hi Caxio, This looks like advanced prepositions mostly. 1a. He is looking for a place to live in. = remove the preposition (in) here as it doesn't work with live in this context 1b. He is looking for a place in which to live. = correct - formal 1c. He is looking for a place to live. （?）= correct - see 1a 2a. a good restaurant for Tom to eat at.= correct - meaning Tom would like to be able to eat at this restaurant 2b. a good restaurant at which for Tom to eat. = incorrect Better: a good restaurant for Tom - eating is implied 3a. a good restaurant to eat at. = correct 3b. a good restaurant to eat. = incorrect - unless you are going to eat the restaurant Better: a good restaurant - eating is implied 4. There is somewhere to practice. = correct - meaning a place in which to practice exists (emphasis on is or somewhere) or pointing out where to practice (emphasis on there) 5. There is where to practice. = can be correct if pointing out where to practice Hope this helps.