Tense degan atama bilan ifodalanadi. Macmillian English Dictionary for Advanced Learners lug'atida zamon, ya'ni tense

whom/which/that olmoshlarini tushirib qoldirishimiz ham mumkin.

The man I wanted to see was away on holiday. (=whom (that) I wanted to see)

Most of the people I invited to the party couldn't come.(=whom I invited to the party)

Have you found the keys you lost? (=which(that) you lost?)

The dress Ann bought doesn't fit her very well. (=which (that) Ann bought)
Agar toʻldiruvchi oldida predlog boʻlsa, predlog whom/which soʻzlaridan oldin qoʻllaniladi.

The girl with whom he fell in love left him after a few weeks.

The bed in which I slept last night wasn't very comfortable.
what olmoshi gapda ba'zan nima/nimaiki degan ma'noda qoʻllaniladi.

What happened was my fault. (Nimaiki sodir boʻlgan boʻlsa - mening aybim.)
Yuqoridagi gapni relative clause bilan ham qoʻllashimiz mumkin.

Everything that happened was my fault. (Sodir boʻlgan hamma narsa - mening aybim...everything
what emas.)
Quyidagi gaplarga e'tibor bering:

I gave her all the money (that) I had. (...what I had emas.)

I'll do the best that I can. (...what I can emas.)

This is an awful film. It's the worst that I've ever seen. (...what I've ever seen emas.)

Tell me what you want and I'll try to help you. (...that you want emas.)

I don't agree with what you have just said. (...that you have just said emas.)
whose olmoshi relative clauseda egalik sifatlari (his/her/their/its) oʻrnida qoʻllaniladi.
We saw some people. Their car had broken down. (...ikkita gap, ikkinchi gapda their olmoshi
qoʻllanilgan.)
We saw some people whose car had broken down. (...bitta gap, their olmoshi oʻrnida whose
olmoshi qoʻllanilgan.)
A widow is a woman whose husband is dead. (...her husband is dead.)
What is the name of the girl whose car you borrowed? (...you borrowed her car.)