[Q]: Would the following sentence, by the strictest standards, be considered correct? John couldn't leave the party.
++++++++++
[A]: acceptable

[Q]: Would the following sentence, by the strictest standards, be considered correct? We hope that such a vaccine could be available in ten years.
++++++++++
[A]: acceptable

[Q]: Would the following sentence, by the strictest standards, be considered correct? I sent a book to Louis.
++++++++++
[A]:
acceptable