Hello, I hope everyone is in good health😊

I often get bewildered regarding “which” and “that” I don't know what to put here.

1- I have found the pen “which/that” I lost.
2- Here is the book “that/which” you lent me.
3- please suggest dictionary “which/that” includes phrasal verbs and idioms.
4- This is the house “which/that” belongs to my uncle.

Question

Hello, I hope everyone is in good health😊

I often get bewildered regarding “which” and “that” I don't know what to put here.

1- I have found the pen “which/that” I lost. 
2- Here is the book “that/which” you lent me.
3- please suggest dictionary “which/that” includes phrasal verbs and idioms.
4- This is the house “which/that” belongs to my uncle.

Answer

In all of these sentences you can use either "which" or "that". I mean you can use "that" or "which" and both the sentences would be correct.

Evden çıkmadan dil öğrenme fırsatını kaçırmayın. Deneyimli dil eğitmenlerimizden oluşan seçkimize göz atın ve ilk dersinize şimdi kaydolun!