3 questions

1)According to Mr Micheal Swan (pratical English usage, page 486), the first line said:

"note that the conjunction (the second that) is usually dropped in this tructure, it must be dropped if the relative pronoun is a subject

This is the woman (who/that) Ann said could show us the church

I think he implied '(who/that" formed as a subject but I think the subject is only "This is the woman " (who/that) is just a conjunction..... Am I right? Could you please make it clearer?

2) This question has nothing to do with the previous one,I've seen on the 4th page of Oxford dictionary Advanced learner's dictionary, and I found out these line:

First published I948 (12 impressions)

... Seventh edition (4th impression)

I really don't understand "impression" there and the 4th,

Mister Micawber wrote:

1)  This is the woman (who/that) Ann said [who/that] could show us the church. Swan is speaking of the already dropped second who/that, which I have just reinserted in your sentence-- they are the subject of the dependent clause, 'who/that could show us the church', and must be dropped here. 2) Seventh edition (4th impression) -- it is the fourth printing of the 7th edition.  It has presumably sold out 3 times previously, and more copies were needed; the text, however, was not changed, so it remains the 7th edition. 3)  Direct: Shall we be there tomorrow?  Indirect: They asked if they would be there the next day. Direct:  Are we going to be there tomorrow?  Indirect:  They asked if they were going to be there the next day.

Much thanks, Mister, but Swan said again, in page 252 of Pratical English Usage, he gave an example:

Direct: Shall I be needed tomorrow?

Indirect: He wants to know if he will be needed tomorrow

I wonder why he wrote the sentence in future tense, could you make it clearer?