* S + be + Ved/3 + place + by SO + time.
+) This dress is bought by Miss Lam.
- This car was repaired by him yesterday.
- The homework has been finished by my friend yet.
-) This dress isn't bought by Miss Lam.
- This car wasn't repaired by him yesterday.
- The homework hasn't been finished by my friend yet.
?) Is this dress bought by Miss Lam?
- Was this car repaired by him yesterday?
- Has the homework been finished by your friend yet?
* S + tobe + adj + ( for SO ) + to V
This text was difficult for us to do.
This coffee is too hot for her to drink.