`41.` It was said that he was friendly to his classmate

It + be + V_ed/ V3 + that + S + V

`42.` If he worked hard enough, you wouldn't lose his job

If + S + V_ed/ V2, S + would + V_inf

`43.` Would you mind if I opened the door?

Would you mind + if + S + V_ed/ V2?

`44.` If don't think carefully, you won't come up with the best solution

If + S + V_inf/ V_s/ V_es, S + will + V_inf

`45.` Her best friend is not as intelligent as her

$S_{1}$ + be + (not) + as + adj + as + $S_{2}$

`46.` The Pyramid of Giza was built thousands of years ago

S + was/ were + V_ed/ V3

`47.` She said that there had been a man living in that house the year before 

S + said that + S + V

QKĐ → QKHT