You can only take up occupation once the tenancy has been signed.你签了租赁合同后才能迁入。There's a safeguard built into the tenancy agreement that says the landlord must give you three months’ notice to quit.租赁合同里写着一条保护性条款,规定房东终止合同前必须提早三个月通知你。Tenants should check their tenancy agreements closely.租户应该认真核对租赁合同。