1. укажите названия времени, в котором употреблены глаголы, и переведите их на язык. 1)was being sent 2)were sent 2. вставьте глагол to be в нужной форме. 1)when he came the by natalie. 2) a new toy tomorrow. 3. поставить предложения в пассивный залог. 1) mr.brown has just dictated a letter to his secretary. 2) he is packing his suitcase now. 3) they will have signed the contract by tomorrow.

#1
Past Continuous Passive -отправлялось
Past Simple Passive-были отправлены.
#2
When he came the guests were being entertained(had been entertained) by Natalie.
She will be promised a new toy tomorrow.
#3
A letter has just been dictated by Mr. Brown to his secretary. 
His suitcase is being packed by him now.
The contract will have been signed by them by tomorrow. 

1.  1) Past Continuous in Passive Voice, отправлялось (письмо, например)
     2) Past Simple in Passive Voice, были отправлены.
2.  1) When he came the guests had been entertained by Natalie.
     2) She is promised a new toy tomorrow.
3.  1) A letter has just been dictated by Mr. Brown to his secretary. 
     2) His suitcase is being packed now.
     3) The contract will has been signed by tomorrow.