Help me! Which sentence is correct? I'm confused about using a phrase including "which" in English. Is there anyone who tell me which is correct and why? Pay attention the sentences below around "( )". And is there any differences among the correct sentences? like formal/casual, spoken English/writing English, something like that. I suppose the number 1-2 and 2-4 are incorrect. Is it true? 1-1) I'm looking for a job (in which) I can combine the different aspects of my experience so far. (O) 1-2) I'm looking for a job (which) I can combine the different aspects of my experience so far. (X) 1-3) I'm looking for a job (that) I can combine the different aspects of my experience so far. (O) 2-1) This is the house (that) I live. (O) 2-2) This is the house (where) I live. (O) 2-3) This is the house (in which) I live. (O) 2-4) This is the house (which) I live (in). (O) 2-4) This is the house (which) I live. (X)