I've found this lesson quite difficult! The first set of examples ("Look at ..."), and most of the rest, sound very odd in English, and it's only Gruff's answer from five years ago that makes it clear that the phrase or sentence would not normally stand alone. Could more (or all) of the examples be made to make this clear? Also, in the first couple of examples (where there is an introductory sentence), the English translation is "... must have ..." and everywhere else it's "... will have ...". I think that the 'must' is wrong, but it's at least confusing! Hoping to help ...
PS
I now see that a similar discussion about contextual examples has taken place and been acted upon in the companion lesson (on irregular participles).