Please have a look at "yet" in this sentence.?

Question

Scientists have yet to determine the cue for Chusquea abietifolia's seasonal rhythm.

according to a dictionary:

yet (yt)

adv.

1. At this time; for the present: isn't ready yet.

2. Up to a specified time; thus far: The end had not yet come.

3. At a future time; eventually: may yet change his mind.

4. Besides; in addition: returned for yet another helping.

5. Still more; even: a yet sadder tale.

6. Nevertheless: young yet wise.

conj.

And despite this; nevertheless: She said she would be late, yet she arrived on time.

http://www.thefreedictionary.com/yet

I want to know which is the meaning of the "yet". Thank you!

Answer 1

Hey

i thought the meaning of 'yet' in that sentence would be

2. Up to a specified time; thus far: The end had not yet come.

as until now, or 'thus far' the scientists have not roud the cue for "Chusquea abietifolia's seasonal rhythm"

hope it helps

Answer 2

It is one of the first three adverbial meanings - but these three are so similar that it's hard to tell which!

It really depends on whether you want to emphasise the past, present or future.  If you mean 'up to now, scientists have been unable to determine...' then it's meaning 2.

If you mean 'scientists cannot determine at present, but may do so sometime...' then it's meaning 1.

If you mean 'it is definitely expected that they will determine', it's meaning 3.

Answer 3

Words must be understood in a certain circumstance, the word yet really has many meanings~

Answer 4

All of the above.

Answer 5

number 3, because they're both talking about the future