[lojban-beginners] More Turner/Nicholas lesson questions

[der Mouse <mouse@Rodents.Montreal.QC.CA>]

As I mentioned in my previous thread head, I've been working through
the Turner/Nicholas lessons.  I've now got some more questions, if
anyone could be kind enough to take a few moments for them.


Lesson 9, Exercise 4 (collapse two sentences into one with poi), item 5:

	.i mi viska va le barja le ninmu .i mi klama le barja le briju

The answer given is

	.i mi viska va le barja poi mi klama fi le briju ku'o le ninmu

which is fine.  When answering this, I didn't write that, but I came up
with two other alternatives:

	.i mi viska va le barja poi mi klama ke'a le briju ku'o le ninmu
	.i mi viska va le barja poi se klama mi le briju ku'o le ninmu

After reading the explanation accompanying the answer, I'm fairly sure
the first is a reasonable alternative (it's just a question of whether
you'd rather use fi or ke'a).  But what about the second?  Is it a
reasonable rendition?  (And if not, why not?)


Lesson 9, Exercise 6 answer, item 1:

     Note: That odd expression lo cacra be li pimu is in fact how you'd
     normally say 'half an hour.' In general, when Lojban measures
     things, it doesn't divide them up into n individual units, but
     rather says that x measures n units. So "Reading this lesson took
     me two hours" would be in Lojban lenu mi tcidu le vi ve cilre cu
     cacra li re.

So why is it "cacra li re" but not "cacra li pimu" - why the lo...be?
Is this the difference between "half an hour" and "a half-hour", and if
so, why is the be needed rather than using "lo cacra li pimu"?


Lesson 10, Exercise 2, answer for item 6:

Is it my imagination, or should all "ni'i"s be changed to "seni'i"s in
these two paragraphs?


Lesson 15, the "tu'a" section:

Two of the examples given here as motivations for "tu'a" are

     lenu la djiotis. cu co'e cu cinri

     lenu la jan. co'e cu fenki

But it is left unexplained why one contains a "cu" where the other
doesn't.  I see no difference between them that explains it; is this
simply a case of an unnecessary cmavo ("cu") making an appearance, or
is the "cu" necessary (and if so, why?)?

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