Make a passive sentence They use this word in mearnings.
If the work ___ (not to finish) by evening you'll be a trouble.
She(not, to introduce) by the hostess and left embararrassed as she herself didn't know anybody.
I was sure that if the figures(to check) properly the mistake(to find) easily.
Everybody listened to the lecturer with great attention.
The letters (to sort) into the different streets.

Active: They use this word in mornings.
Passive: This word is used in mornings.

In the first sentence, we are changing the subject "They" to be the object and placing the word "this" as the subject of the passive sentence. We also change the verb "use" to "is used" as it is in the passive form.

Active: If the work is not finished by evening, you'll be in trouble.
Passive: If the work is not finished by evening, you'll be in trouble.

In the second sentence, there is no change needed as it is already in the passive form.

Active: She was not introduced by the hostess and left embarrassed as she herself didn't know anybody.
Passive: She was not introduced by the hostess and left embarrassed as she herself didn't know anybody.

In the third sentence, there is no change needed as it is already in the passive form.

Active: I was sure that if the figures were checked properly, the mistake would be found easily.
Passive: I was sure that if the figures were checked properly, the mistake would be found easily.

In the fourth sentence, there is no change needed as it is already in the passive form.

Active: Everybody listened to the lecturer with great attention.
Passive: The lecturer was listened to by everybody with great attention.

In the fifth sentence, we are changing the subject "Everybody" to be the object and placing "The lecturer" as the subject of the passive sentence. We also change the verb "listened to" to "was listened to" as it is in the passive form.

Active: The letters are sorted into the different streets.
Passive: The letters are sorted into the different streets.

In the sixth sentence, there is no change needed as it is already in the passive form.