... isn’t Thuan here now? - He is busy with the housework. 100% sure - He must be busy with the housework 95% sure - He could be busy with the housework not very sure - He may be busy with ... man, whom Iyou met last Christmas, is going to be my brother-in-law.Note• That cannot be used to replace who, whom, which in non-defining relative clauses.• Relative pronouns used as objects ... studiedenthusiastically for months. tranaigv@gmail.com - …………………. I am just going around.5. ………………… must have worked on my computer. Some of my data havebeen deleted. - I have been sitting in the room since...