В таких заданиях не силен)
It was obvious that he ответ lonely here, with no relatives of friends.(to feel)
It became evident that soon digital systems of information transmission ответ analog systems (to replace).
I felt he ответ what he had told. (to regret)
He announced that the Russian delegation ответ the session to show its protest.(to leave)
We knew that in telecommunication the information always ответ between transmitters and receivers (to be directed).
It was reported that specialists already ответ their work on HDTV (to start).
We got a letter confirming that they ответ to transfer the money as soon as possible.(to plan)
Our engineer announced that he ответ an optical computer then (to build).
She admitted that she ответ the job here a month before.(to start)
She asked me how many books I ответ (to read) last month.

Это довольно сложная тема.

Смотри, при преобразование прямой речи в косвенную, прямая речь преобразуется в время.

То есть, Present Simple (настоящее простое)→ на простое):

Present Continuous→Past Continuous

Past simple→Past Perfect

Present Perfect→Past Perfect

Past Perfect→Past Perfect

Past Continuous→ Past Perfect Continuous

(Future Simpe)Will→Would(Future -in-the past)

Can→Could

May/Might→Might

Should→Should

Must/have to→Must or had to

Ought to→Ought to

Present Perfect Continuous→Past Perfect Continuous

Например: ''I love you''- Nastya said ---- She said that she loved me( Prasent Simple на Past Simple)

Впереди всегда ставится To be( she, he,they,we...) said/told/ask

Told используется когда к кому-то обращаются. Например: She told me/us/them/her/him that she had called the day before.

Ask используется в вопросительных предложениях. Например: He ask,'' Did you study?'' преобразуется в He asked me if  I had studyed.

При преобразовании вопроса в косвенную речь He/she/they asked me if ( формула) добавляется I had studyed( не как вопрос did you study?, мы должны преобразовать этот вопрос в утвердительное предложение, то есть did you study? ---- I studyed и уже его изменить на косвенное предложение I studyed( Past Simple) --- I had studyed( Past Perfect)

Не обязательно ставить везде that, так просто проще для понимания

Так же есть слова которые тоже изменяются и их нужно заучить,запомнить

Прямая речь                  Косвенная речь

today                                that day

now                                   then/at the moment

yesterday                          the day before

... day/year/month ago     ... day/year/month before

last week/day/year           the week/day/year before

next week/day                  the following week/day

tomorrow                           the next/following day

here                                   there

this                                     that

these                                 those

ago                                    previously/before

tonight                               that night

The government hasn't been trying to reduce the air pollution.How long have you been driving lessons?I have been learning English for a long timeWe all should try to make up with friends soon after silly tiffs.I cannot make out this rule.She has been trying to raise money for the zoo for months.We have been working hard to build nesting boxes.I have been volunteering to help stray animals for a year now!Rose is cleaning out the pond, isn't she?You can speak three languages, cannot you?There weren’t any spots there, were there?He has been working hard, hasn't he?She walked to work, didn't she?Tony won’t work in the garden, will he?Bill always cleans his room, doesn't he?Ray broke his arm yesterday, didn't he?Children like reading fairy tales, don't they?