Difference between "sold" and "sold out"

[Sergey]

Test No. incompl/inter-13 "At the Theatre", question 10

As always his latest play has been a huge success and all the tickets are ......... until August.

(a) taken out
(b) put out
(c) sold out
(d) bought out

Test No. incompl/inter-13 "At the Theatre", answer 10

As always his latest play has been a huge success and all the tickets are sold out until August.

Correct answer: (c) sold out

Your answer was: n/a
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What the difference between sold and sold out?

thanks
Sergey

[Alan]

Sold means thet have been bought - sold out means they have been bought totally and there is no ticket available.
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English as a Second Language
You can read my ESL story Word Story: Jokes

[Haihao]

[Mister Micawber]

.
1-- Just this year. Be in simple present tense is now: I am tired.

2-- No contradiction: all of the tickets available from now until August are sold out. August tickets are available. All does not require universal application: All the people in this room are gay does not mean that all people everywhere are gay.
.
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Native English teacher at Mister Micawber's

[Haihao]

Thank you very much, Mister Micawber. Now nothing is unclear with it.

haihao