No. The signed lease contract does not clearly stipulate the terms of subletting, so the roommate cannot sublet the room to other people without authorization, because the two parties should have agreed on the lease term, rent and other details before signing the contract. If the roommate wants to Subletting a room requires the consent of the signatory and a revised contract with the landlord, otherwise, they may violate the terms of the contract, resulting in a breach of contract. Sharing means that at least two people rent a house or a house together. It is a relatively common way of living. The main reason for the phenomenon of shared housing is that the rent is too high for one person or a family to afford.