For the same reason, reflexive verbs are conjugated with être, because they also express that a state is enjoyed as soon as the action is over.
"As soon as you have washed yourself you are washed—if you have done it properly, of course."
Tell the boys so, and they will laugh, and they will understand you, and they will be grateful to you.
I could give hundreds of instances in which a few explanatory words would settle grammatical facts in boys' minds; but, although I am tempted at almost every page to turn this book into a class—book, I must bear in mind that my aim is not to instruct, and pass on.
IX.
How to be Happy though a school-master. — Suggestions and Hints for the Class-room. — Boys on History and Geography. — "Maxims" and "Wise Thoughts." — Advice to Those About to Teach. — "Sir," and not "Mossoo." — "Frauleins" and "Mademoiselles." — "Check" your Love for Boys. — No Credit. — We are all Liable to Make Mistakes. — I Get an Insight into "Stocks."
I know masters who spend their time looking at their books with their heads downwards, and who only occasionally lift them up to say to a boisterous class:
"Now then, now then!"