‘’If only’’ / [umid,qilmoq, afsuslanmoq] a] If only + present / future tense=[hope]

which (subject) interests me.
That is the topic on which (object of preposition) I will write.
I tried to suggest ways in which (object of preposition) the plans could be improved, but he slapped me down.

that	subject/object (people/ things)	Art that (subject) is in public places can be enjoyed by everyone. The painting that (complement) Ms.Wallace (subject) bought was very expensive.
Where	(place)	The site where the bank plans to build its new head quarters is in a seismic zone.
when	(time)	I will never forget the day when I met you.