КАК правильно поставить время? . Who you (talk) to on the phone as I came in? — I (talk) to Mr Pitt.

Question

Who you (talk) to on the phone as I came in — I (talk) to Mr Pitt.

I went into the garden to srr what the boys (to do). 
The traffic made so much noise that i couldn't hear what he (to say). 
From the sounds it was clear that Marry ( to practice) the piano. 
John (to work) all the day yesterday. 
He watched the children for a moment. Some of them (bathe) in the sea, others (to play) on the sand. 
In (to rain) when we went out. 
I ( to play) the piano when he came into the room. 
I came into the room when Mary (to play) the piano. 
 The students (to talk) excitedly when the teacher came in, but they (to stop) at once when the teacher ( to speak). He (to walk) across the romm and ( to begin) to write questions on the blackboard. While he ( to write) , the students ( to sit) down, (to take) out their pens and (to prepare) themselves for the test. The teacher ( ti finish) writing ( to sit) down in front of the class and (to open) a book the whole time while the students (to answer) questionts.

Искандар Акбаров · Accepted Answer

The traffic made so much noise that i couldn't hear what he HAD SAID 
From the sounds it was clear that Marry WAS PRACTISING the piano. 
John WAS WORKING all the day yesterday. 
He watched the children for a moment. Some of them WERE BATHING in the sea, others WERE PLAYING on the sand. 
It WAS RAINING when we went out. 
I WAS PLAYING the piano when he came into the room. 
I came into the room when Mary WAS PLAYING the piano.

Red Berry · Answer

Who were you talking to over the phone as I came in? - I was talking to Mr.Pitt

Ян Иванов · Answer

Whom were you talking to when I came in? 
I was talking to Mr. Pitt 
 
Подсказка на будущее- когда два действия одновременно, как правило будет или оба Continuous, либо Continuous для действия которов уже происходило на тот момент, когда произошло второе, тогда второв, внезапное будет в Past Simple: 
 
When I walked in the room my wife was kissing my brother. 
 
А можно встречный вопрос: вот само задание в том виде, в которoм вы написали, откуда оно, я имею в виду: 
" Who you (talk) to on the phone as I came in? " 
дело в том, что там грубая ошибка, интересен источник, имя автора учебника. Спасибо :)

Елена Селиверова · Answer

Who were you talking to on the phone as I came in? — I was talking to Mr Pitt.

Сердар · Answer

Who had you been talking to on the phone as I came in — I'd been talking to Mr Pitt.