Question

Adjective clause

[47] He taught me a lesson.
I cannot forget it so soon.
[48] My brother sent me a letter.
The letter had no stamp on it.
[49] He is a pleader.
I have rented his house.
[50] Some men are true to their word.
I like such men.​

Answer 1

[47] He taught me a lesson which/that I cannot forget so soon.

[48] My brother sent me a letter which/that had no stamp on it.

[49] I have rented his house who is a pleader.

[50] I like such men who are true to their word.