[Q]: Would the following sentence, by the strictest standards, be considered correct? He can't have been working.
++++++++++
[A]: acceptable

[Q]: Would the following sentence, by the strictest standards, be considered correct? Tom is confident that the elephants respect him.
++++++++++
[A]: acceptable

[Q]: Would the following sentence, by the strictest standards, be considered correct? Mary should buy some flowers for her mother to arrange.
++++++++++
[A]:
acceptable