Passive voice 2

[Molly]

[Molly]

From the Cambridge Grammar of English.

Let is not normally used in the passive when it means ‘allow/permit’:
The families were not allowed to see the children.
*(The families were not let see the children.)

[Nessie]

Yea, I also want to know Alan's idea. However may be he's busy these days because I can't him here very often...

Too many ideas up till now => (+_+)
Now let me put it in a nutshell and please check if it is right:

1/ for the first question, "he was seen stealing..." is correct and widely used, "he was seen to steal..." is also used sometimes, but not as much and suitable, all right?
2/ for the second question, "be allowed to..." is the most and only correct option, and "let" is VERY RARELY used in passive voice, ok?

[Nessie]

Besides, dear Amy, you haven't answered my question about whether "he was seen steal" your car is acceptable. And if not, how can we know which is the original sentence of "he was seen stealing your car" ( I mean: is it "People saw him steal your car" or "people saw him stealing your car"?)

Many many thanks....
Nessie

[Jamie (K)]