3. (Object of the preposition).
3.1 Persons
Can use the following.
, whom + subject + verb ... .. + preposition, ...... or.
...., Preposition + whom + subject + verb.
3.2 Things
For example, the
= The Oriental Hotel, which I stayed at last night, is very big.
4. Possessive
4.1 Persons whose use as
= My eldest brother, whose girlfriend you saw last Sunday, has just got married.
4.2 Things of Use which or with + Adj. + Noun, for example.
= My uncle's house, of which the window is brown, is on Silom Road.