Your brother has his work to do, also.
Whatever the nature of it may be, he has taken it up and he must go through with it.

It would be of no use his worrying for fear that you should forget your words or your notes to-night, and there is no purpose in your fretting because there may be danger in what he has to do.

I promise you that so far as I can prevent it, he shall take no unnecessary risks.

Now, if you like, I will walk home with you young people, if I sha'n't be terribly in the way.

I know that Sidney wants to see me." They left the restaurant, a few minutes later, and strolled up towards the town.