Q: If And David Plotz has dismally failed to change my mind., can we say that "He failed to change my mind about immigration."?

A: it is not possible to tell

Q: If The respondents are asked, among other things, if they read advertising mail and if they find it useful., can we say that "The respondents were not questioned about advertising."?

A: no

Q: If i'm looking forward to it in about a just just over a year myself, can we say that "In just over a year for me."?

A: yes

Q: If Tuppence had therefore very little fear of proving inefficient., can we say that "Tuppence had no fear of being inefficient."?

A:
it is not possible to tell