By six o'clock on Sunday I had already learned all the words

К шести часам в воскресенье я уже выучил все слова.

By six o'clock on Sunday I hadn't  learned all the words yet.

By what time on Sunday had I learned all the words?

By six o'clock on Sunday you had already learned all the words, had't you?

She had left by the 1st of June - Она уехала (еще) до первого июня.

She hadn't  left by the 1st of June yet.

Had she left by the 1st of June?

She had left by the 1st of June, hadn't she?

She had written only two letters by noon

К полудню она написала только 2 письма.

She hadn't  written  letters by noon.

She hadn't  written  letters by noon, had she?

How many letters had she  written by noon?

We hadn't finished our work by her returning.

Verified answer

Вопр.

Had you listened to the radio?

Had Benjamin broken the rules?

Had Gareth emptied the bin?

Had they swum in the lake?

Had we enjoyed our holiday?

Отриц.

We had not opened the door.

They had not called us.

They had not swum in the lake.

We had not enjoyed our holiday.